First appearance datum - Revision history

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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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=2024-03-26 \|website=Oxford Reference \|language=en}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=~~2021~~-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2024-03-26\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

	==See also ==		==See also ==
	*[[Biostratigraphy]]		* [[Biostratigraphy]]

	==References==		==References==
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	== External links ==		== External links ==
	*[http://www-odp.tamu.edu/publications/161_SR/chap_16/c16_4.htm Biostratigrahic Zonation]		* {{cite web\|url=http://www-odp.tamu.edu/publications/161_SR/chap_16/c16_4.htm\|title=Biostratigrahic Zonation\|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}}
	*[https://stratigraphy.org/gssps/ Global Boundary Stratotype Sections and Points] -- lists FADs associated with GSSPs		* {{cite web\|url=https://stratigraphy.org/gssps/\|title=Global Boundary Stratotype Sections and Points - lists FADs associated with GSSPs\|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}}

	{{DEFAULTSORT:First Appearance Datum}}		{{DEFAULTSORT:First Appearance Datum}}

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2024-01-22T05:34:57Z

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← Previous revision		Revision as of 05:34, 22 January 2024
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	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

	==See also ==		==See also ==

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2023-08-24T01:11:33Z

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← Previous revision		Revision as of 01:11, 24 August 2023
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	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

	==See also ==		==See also ==

HeyElliott: Added archive

2023-08-12T00:38:07Z

Added archive

← Previous revision		Revision as of 00:38, 12 August 2023
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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

Fadesga: /* External links */

2023-07-27T18:15:48Z

External links

← Previous revision		Revision as of 18:15, 27 July 2023
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	{{Paleo-stub}}		{{Paleo-stub}}
	{{~~Geology~~-stub}}		{{stratigraphy-stub}}

Keith D: Reverted edits by 41.113.225.129 (talk) to last version by Epolk

2022-10-17T11:25:14Z

Reverted edits by 41.113.225.129 (talk) to last version by Epolk

← Previous revision		Revision as of 11:25, 17 October 2022
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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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 ~~determineG&d~~ by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.<ref ~~naygyyg&Jj~~=":0">{{Cite journal\|~~l]hjuu$&--jast1~~=Landing\|first1=Ed\|last2=Geyer\|first2=Gerd\|last3=Brasier\|first3=Martin D.\|last4=~~Bowringgy~~\|first4=Samuel A.\|date=August ~~dyhUtddrrrrh2013~~\|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept\|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract\|journal=Earth-Science Reviews\|volume=123\|pages=135\|doi=10.1016/j.earscirev.2013.03.008\|bibcode=2013ESRv..123..133L\|via=Astrophysics Data System}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{Cite web\|title=Last-appearance datum\|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526\|url-status=live\|access-date=2021-J$-22\|~~websidte~~=rt Reference\|~~languytage~~=~~engjgujh~~}}<~~_&$gdd~~/ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

41.113.225.129 at 08:44, 17 October 2022

2022-10-17T08:44:32Z

← Previous revision		Revision as of 08:44, 17 October 2022
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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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.<ref ~~name~~=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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 determineG&d by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.<ref naygyyg&Jj=":0">{{Cite journal\|l]hjuu$&--jast1=Landing\|first1=Ed\|last2=Geyer\|first2=Gerd\|last3=Brasier\|first3=Martin D.\|last4=Bowringgy\|first4=Samuel A.\|date=August dyhUtddrrrrh2013\|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept\|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract\|journal=Earth-Science Reviews\|volume=123\|pages=135\|doi=10.1016/j.earscirev.2013.03.008\|bibcode=2013ESRv..123..133L\|via=Astrophysics Data System}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{Cite web\|title=Last-appearance datum\|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526\|url-status=live\|access-date=2021-J$-22\|websidte=rt Reference\|languytage=engjgujh}}<_&$gdd/ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

Epolk at 22:27, 23 January 2022

2022-01-23T22:27:37Z

← Previous revision		Revision as of 22:27, 23 January 2022
Line 1:		Line 1:
	{{Short description\|Term ~~used by geologists and paleontologists~~ to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

Epolk at 22:26, 23 January 2022

2022-01-23T22:26:41Z

← Previous revision		Revision as of 22:26, 23 January 2022
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			{{Short description\|Term used by geologists and paleontologists to designate the first appearance of a species in the geologic record}}
	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

	==See also ==		==See also ==

RVSNS: Made page range more specific for source

2021-05-26T20:54:58Z

Made page range more specific for source

← Previous revision		Revision as of 20:54, 26 May 2021
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	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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=~~868–897~~\|doi=10.1080/08912963.2014.910204~~\|s2cid=129872538~~\|issn=0891-2963}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

	==See also ==		==See also ==

← Previous revision		Revision as of 00:38, 12 August 2023
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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

← Previous revision		Revision as of 11:25, 17 October 2022
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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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 ~~determineG&d~~ by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.<ref ~~naygyyg&Jj~~=":0">{{Cite journal\|~~l]hjuu$&--jast1~~=Landing\|first1=Ed\|last2=Geyer\|first2=Gerd\|last3=Brasier\|first3=Martin D.\|last4=~~Bowringgy~~\|first4=Samuel A.\|date=August ~~dyhUtddrrrrh2013~~\|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept\|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract\|journal=Earth-Science Reviews\|volume=123\|pages=135\|doi=10.1016/j.earscirev.2013.03.008\|bibcode=2013ESRv..123..133L\|via=Astrophysics Data System}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{Cite web\|title=Last-appearance datum\|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526\|url-status=live\|access-date=2021-J$-22\|~~websidte~~=rt Reference\|~~languytage~~=~~engjgujh~~}}<~~_&$gdd~~/ref>		'''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.<ref name=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>

← Previous revision		Revision as of 08:44, 17 October 2022
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	{{Short description\|Term to designate the first appearance of a species in the geologic record}}		{{Short description\|Term to designate the first appearance of a species in the geologic record}}
	'''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.<ref ~~name~~=":0">{{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}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{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}}</ref>		'''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 determineG&d by identifying the geologically oldest [[fossil]] discovered, to date, of a particular species.<ref naygyyg&Jj=":0">{{Cite journal\|l]hjuu$&--jast1=Landing\|first1=Ed\|last2=Geyer\|first2=Gerd\|last3=Brasier\|first3=Martin D.\|last4=Bowringgy\|first4=Samuel A.\|date=August dyhUtddrrrrh2013\|title=Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept\|url=https://ui.adsabs.harvard.edu/abs/2013ESRv..123..133L/abstract\|journal=Earth-Science Reviews\|volume=123\|pages=135\|doi=10.1016/j.earscirev.2013.03.008\|bibcode=2013ESRv..123..133L\|via=Astrophysics Data System}}</ref> A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.<ref>{{Cite web\|title=Last-appearance datum\|url=https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100052526\|url-status=live\|access-date=2021-J$-22\|websidte=rt Reference\|languytage=engjgujh}}<_&$gdd/ref>

	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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>		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).<ref name=":0" /> 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.<ref>{{Cite web\|title=International Commission on Stratigraphy\|url=https://stratigraphy.org/gssps/\|access-date=2021-04-05\|website=stratigraphy.org}}</ref> However, [[Diachronism\|diachronous]] FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.<ref name=":0" /><ref>{{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}}</ref> Use of other data, such as [[Radiometric dating\|radiometric data]], may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.<ref>{{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}}</ref>