https://en.wikipedia.org/w/index.php?action=history&feed=atom&title=First_appearance_datum First appearance datum - Revision history 2025-06-12T00:57:43Z Revision history for this page on the wiki MediaWiki 1.45.0-wmf.4 https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1215645521&oldid=prev Xiphactinus88: Templates 2024-03-26T10:23:06Z <p>Templates</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:23, 26 March 2024</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web |title=Last-appearance datum |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |url-status=live |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 |access-date=<del style="font-weight: bold; text-decoration: none;">2021</del>-<del style="font-weight: bold; text-decoration: none;">04</del>-<del style="font-weight: bold; text-decoration: none;">22</del> |website=Oxford Reference |language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web |title=Last-appearance datum |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |url-status=live |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 |access-date=<ins style="font-weight: bold; text-decoration: none;">2024</ins>-<ins style="font-weight: bold; text-decoration: none;">03</ins>-<ins style="font-weight: bold; text-decoration: none;">26</ins> |website=Oxford Reference |language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=<del style="font-weight: bold; text-decoration: none;">2021</del>-<del style="font-weight: bold; text-decoration: none;">04</del>-<del style="font-weight: bold; text-decoration: none;">05</del>|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931|hdl=20.500.12210/34398|hdl-access=free}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538|hdl=11336/80106|hdl-access=free}}&lt;/ref&gt;</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=<ins style="font-weight: bold; text-decoration: none;">2024</ins>-<ins style="font-weight: bold; text-decoration: none;">03</ins>-<ins style="font-weight: bold; text-decoration: none;">26</ins>|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931|hdl=20.500.12210/34398|hdl-access=free}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538|hdl=11336/80106|hdl-access=free}}&lt;/ref&gt;</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*[[Biostratigraphy]]</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*<ins style="font-weight: bold; text-decoration: none;"> </ins>[[Biostratigraphy]]</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==References==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==References==</div></td> </tr> <tr> <td colspan="2" class="diff-lineno">Line 11:</td> <td colspan="2" class="diff-lineno">Line 11:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== External links ==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== External links ==</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*<del style="font-weight: bold; text-decoration: none;">[</del>http://www-odp.tamu.edu/publications/161_SR/chap_16/c16_4.htm<del style="font-weight: bold; text-decoration: none;"> </del>Biostratigrahic Zonation<del style="font-weight: bold; text-decoration: none;">]</del></div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*<ins style="font-weight: bold; text-decoration: none;"> {{cite web|url=</ins>http://www-odp.tamu.edu/publications/161_SR/chap_16/c16_4.htm<ins style="font-weight: bold; text-decoration: none;">|title=</ins>Biostratigrahic Zonation<ins style="font-weight: bold; text-decoration: none;">|website=tamu.edu|archive-url=https://web.archive.org/web/20240222001746/http://www-odp.tamu.edu/publications/161_SR/chap_16/c16_4.htm|archive-date=2024-02-22|url-status=dead}}</ins></div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*<del style="font-weight: bold; text-decoration: none;">[</del>https://stratigraphy.org/gssps/<del style="font-weight: bold; text-decoration: none;"> </del>Global Boundary Stratotype Sections and Points<del style="font-weight: bold; text-decoration: none;">]</del> <del style="font-weight: bold; text-decoration: none;">-</del>- lists FADs associated with GSSPs</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*<ins style="font-weight: bold; text-decoration: none;"> {{cite web|url=</ins>https://stratigraphy.org/gssps/<ins style="font-weight: bold; text-decoration: none;">|title=</ins>Global Boundary Stratotype Sections and Points - lists FADs associated with GSSPs<ins style="font-weight: bold; text-decoration: none;">|publisher=[[International Commission on Stratigraphy]]|archive-url=https://web.archive.org/web/20240111040625/https://stratigraphy.org/gssps/|archive-date=2024-01-11|url-status=live}}</ins></div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{DEFAULTSORT:First Appearance Datum}}</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{DEFAULTSORT:First Appearance Datum}}</div></td> </tr> </table> Xiphactinus88 https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1197859906&oldid=prev OAbot: Open access bot: hdl updated in citation with #oabot. 2024-01-22T05:34:57Z <p><a href="/wiki/Wikipedia:OABOT" class="mw-redirect" title="Wikipedia:OABOT">Open access bot</a>: hdl updated in citation with #oabot.</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 05:34, 22 January 2024</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 2:</td> <td colspan="2" class="diff-lineno">Line 2:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web |title=Last-appearance datum |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |url-status=live |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 |access-date=2021-04-22 |website=Oxford Reference |language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web |title=Last-appearance datum |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |url-status=live |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 |access-date=2021-04-22 |website=Oxford Reference |language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538|hdl=11336/80106|hdl-access=free}}&lt;/ref&gt;</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931<ins style="font-weight: bold; text-decoration: none;">|hdl=20.500.12210/34398|hdl-access=free</ins>}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538|hdl=11336/80106|hdl-access=free}}&lt;/ref&gt;</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> </tr> </table> OAbot https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1171934361&oldid=prev OAbot: Open access bot: hdl updated in citation with #oabot. 2023-08-24T01:11:33Z <p><a href="/wiki/Wikipedia:OABOT" class="mw-redirect" title="Wikipedia:OABOT">Open access bot</a>: hdl updated in citation with #oabot.</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 01:11, 24 August 2023</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 2:</td> <td colspan="2" class="diff-lineno">Line 2:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web |title=Last-appearance datum |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |url-status=live |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 |access-date=2021-04-22 |website=Oxford Reference |language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web |title=Last-appearance datum |url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |url-status=live |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 |access-date=2021-04-22 |website=Oxford Reference |language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538<ins style="font-weight: bold; text-decoration: none;">|hdl=11336/80106|hdl-access=free</ins>}}&lt;/ref&gt;</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> </tr> </table> OAbot https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1169898158&oldid=prev HeyElliott: Added archive 2023-08-12T00:38:07Z <p>Added archive</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 00:38, 12 August 2023</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web<ins style="font-weight: bold; text-decoration: none;"> </ins>|title=Last-appearance datum<ins style="font-weight: bold; text-decoration: none;"> </ins>|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526<ins style="font-weight: bold; text-decoration: none;"> </ins>|url-status=live<ins style="font-weight: bold; text-decoration: none;"> |archive-url=https://web.archive.org/web/20210422144821/https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526 |archive-date=2021-04-22 </ins>|access-date=2021-04-22<ins style="font-weight: bold; text-decoration: none;"> </ins>|website=Oxford Reference<ins style="font-weight: bold; text-decoration: none;"> </ins>|language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> </tr> </table> HeyElliott https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1167430334&oldid=prev Fadesga: /* External links */ 2023-07-27T18:15:48Z <p><span class="autocomment">External links</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 18:15, 27 July 2023</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 20:</td> <td colspan="2" class="diff-lineno">Line 20:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Paleo-stub}}</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Paleo-stub}}</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{<del style="font-weight: bold; text-decoration: none;">Geology</del>-stub}}</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{<ins style="font-weight: bold; text-decoration: none;">stratigraphy</ins>-stub}}</div></td> </tr> </table> Fadesga https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1116599691&oldid=prev Keith D: Reverted edits by 41.113.225.129 (talk) to last version by Epolk 2022-10-17T11:25:14Z <p>Reverted edits by <a href="/wiki/Special:Contributions/41.113.225.129" title="Special:Contributions/41.113.225.129">41.113.225.129</a> (<a href="/w/index.php?title=User_talk:41.113.225.129&amp;action=edit&amp;redlink=1" class="new" title="User talk:41.113.225.129 (page does not exist)">talk</a>) to last version by Epolk</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 11:25, 17 October 2022</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are <del style="font-weight: bold; text-decoration: none;">determineG&amp;d</del> by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref <del style="font-weight: bold; text-decoration: none;">naygyyg&amp;Jj</del>=":0"&gt;{{Cite journal|<del style="font-weight: bold; text-decoration: none;">l]hjuu$&amp;--jast1</del>=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=<del style="font-weight: bold; text-decoration: none;">Bowringgy</del>|first4=Samuel A.|date=August <del style="font-weight: bold; text-decoration: none;">dyhUtddrrrrh2013</del>|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-<del style="font-weight: bold; text-decoration: none;">J$</del>-22|<del style="font-weight: bold; text-decoration: none;">websidte</del>=<del style="font-weight: bold; text-decoration: none;">rt</del> Reference|<del style="font-weight: bold; text-decoration: none;">languytage</del>=<del style="font-weight: bold; text-decoration: none;">engjgujh</del>}}&lt;<del style="font-weight: bold; text-decoration: none;">_&amp;$gdd</del>/ref&gt; </div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are <ins style="font-weight: bold; text-decoration: none;">determined</ins> by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref <ins style="font-weight: bold; text-decoration: none;">name</ins>=":0"&gt;{{Cite journal|<ins style="font-weight: bold; text-decoration: none;">last1</ins>=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=<ins style="font-weight: bold; text-decoration: none;">Bowring</ins>|first4=Samuel A.|date=August <ins style="font-weight: bold; text-decoration: none;">2013</ins>|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-<ins style="font-weight: bold; text-decoration: none;">04</ins>-22|<ins style="font-weight: bold; text-decoration: none;">website</ins>=<ins style="font-weight: bold; text-decoration: none;">Oxford</ins> Reference|<ins style="font-weight: bold; text-decoration: none;">language</ins>=<ins style="font-weight: bold; text-decoration: none;">en</ins>}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> </tr> </table> Keith D https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1116581642&oldid=prev 41.113.225.129 at 08:44, 17 October 2022 2022-10-17T08:44:32Z <p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:44, 17 October 2022</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are <del style="font-weight: bold; text-decoration: none;">determined</del> by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref <del style="font-weight: bold; text-decoration: none;">name</del>=":0"&gt;{{Cite journal|<del style="font-weight: bold; text-decoration: none;">last1</del>=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=<del style="font-weight: bold; text-decoration: none;">Bowring</del>|first4=Samuel A.|date=August <del style="font-weight: bold; text-decoration: none;">2013</del>|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-<del style="font-weight: bold; text-decoration: none;">04</del>-22|<del style="font-weight: bold; text-decoration: none;">website</del>=<del style="font-weight: bold; text-decoration: none;">Oxford</del> Reference|<del style="font-weight: bold; text-decoration: none;">language</del>=<del style="font-weight: bold; text-decoration: none;">en</del>}}&lt;/ref&gt; </div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are <ins style="font-weight: bold; text-decoration: none;">determineG&amp;d</ins> by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref <ins style="font-weight: bold; text-decoration: none;">naygyyg&amp;Jj</ins>=":0"&gt;{{Cite journal|<ins style="font-weight: bold; text-decoration: none;">l]hjuu$&amp;--jast1</ins>=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=<ins style="font-weight: bold; text-decoration: none;">Bowringgy</ins>|first4=Samuel A.|date=August <ins style="font-weight: bold; text-decoration: none;">dyhUtddrrrrh2013</ins>|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-<ins style="font-weight: bold; text-decoration: none;">J$</ins>-22|<ins style="font-weight: bold; text-decoration: none;">websidte</ins>=<ins style="font-weight: bold; text-decoration: none;">rt</ins> Reference|<ins style="font-weight: bold; text-decoration: none;">languytage</ins>=<ins style="font-weight: bold; text-decoration: none;">engjgujh</ins>}}&lt;<ins style="font-weight: bold; text-decoration: none;">_&amp;$gdd</ins>/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> </tr> </table> 41.113.225.129 https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1067519358&oldid=prev Epolk at 22:27, 23 January 2022 2022-01-23T22:27:37Z <p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 22:27, 23 January 2022</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term<del style="font-weight: bold; text-decoration: none;"> used by geologists and paleontologists</del> to designate the first appearance of a species in the geologic record}}</div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term to designate the first appearance of a species in the geologic record}}</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> </table> Epolk https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1067519243&oldid=prev Epolk at 22:26, 23 January 2022 2022-01-23T22:26:41Z <p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 22:26, 23 January 2022</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{Short description|Term used by geologists and paleontologists to designate the first appearance of a species in the geologic record}}</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;<del style="font-weight: bold; text-decoration: none;"> </del></div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=891|doi=10.1080/08912963.2014.910204|issn=0891-2963|s2cid=129872538}}&lt;/ref&gt;</div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> </tr> </table> Epolk https://en.wikipedia.org/w/index.php?title=First_appearance_datum&diff=1025302788&oldid=prev RVSNS: Made page range more specific for source 2021-05-26T20:54:58Z <p>Made page range more specific for source</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Previous revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:54, 26 May 2021</td> </tr><tr> <td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''First appearance datum''' (FAD) is a term used by [[geologist]]s and [[Paleontology|paleontologists]] to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.&lt;ref name=":0"&gt;{{Cite journal|last1=Landing|first1=Ed|last2=Geyer|first2=Gerd|last3=Brasier|first3=Martin D.|last4=Bowring|first4=Samuel A.|date=August 2013|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract|journal=Earth-Science Reviews|volume=123|pages=135|doi=10.1016/j.earscirev.2013.03.008|bibcode=2013ESRv..123..133L|via=Astrophysics Data System}}&lt;/ref&gt; A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.&lt;ref&gt;{{Cite web|title=Last-appearance datum|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526|url-status=live|access-date=2021-04-22|website=Oxford Reference|language=en}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=<del style="font-weight: bold; text-decoration: none;">868–897</del>|doi=10.1080/08912963.2014.910204<del style="font-weight: bold; text-decoration: none;">|s2cid=129872538</del>|issn=0891-2963}}&lt;/ref&gt; </div></td> <td class="diff-marker" data-marker="+"></td> <td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>FADs are frequently used to designate segments in the [[geologic time scale]]. A given FAD can be used to define a [[Global Boundary Stratotype Section and Point]] (GSSP).&lt;ref name=":0" /&gt; For example, the beginning of the [[Tremadocian]] Stage of the [[Ordovician]] Period is marked by the first appearance of the [[conodont]] ''Iapetognathus fluctivagus'' in the geologic record. This occurs in [[Stratigraphy|bed]] 23 of the rock formation known as the Green Point section, located in western [[Newfoundland (island)|Newfoundland]], as well as in geologically correlated [[Stratum|strata]] in many parts of the world.&lt;ref&gt;{{Cite web|title=International Commission on Stratigraphy|url=https://stratigraphy.org/gssps/|access-date=2021-04-05|website=stratigraphy.org}}&lt;/ref&gt; However, [[Diachronism|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.&lt;ref name=":0" /&gt;&lt;ref&gt;{{Cite journal|last1=Servais|first1=Thomas|last2=Molyneux|first2=Stewart G.|last3=Li|first3=Jun|last4=Nowak|first4=Hendrik|last5=Rubinstein|first5=Claudia V.|last6=Vecoli|first6=Marco|last7=Wang|first7=Wen Hui|last8=Yan|first8=Kui|date=2018|title=First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/let.12248|journal=Lethaia|language=en|volume=51|issue=2|pages=248|doi=10.1111/let.12248|issn=1502-3931}}&lt;/ref&gt; Use of other data, such as [[Radiometric dating|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.&lt;ref&gt;{{Cite journal|last1=Pasquo|first1=Mercedes di|last2=Grader|first2=George W.|last3=Isaacson|first3=Peter|last4=Souza|first4=Paulo A.|last5=Iannuzzi|first5=Roberto|last6=Díaz-Martínez|first6=Enrique|date=2015-10-03|title=Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia|url=https://doi.org/10.1080/08912963.2014.910204|journal=Historical Biology|volume=27|issue=7|pages=<ins style="font-weight: bold; text-decoration: none;">891</ins>|doi=10.1080/08912963.2014.910204|issn=0891-2963<ins style="font-weight: bold; text-decoration: none;">|s2cid=129872538</ins>}}&lt;/ref&gt; </div></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td> </tr> <tr> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> <td class="diff-marker"></td> <td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==See also ==</div></td> </tr> </table> RVSNS