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First appearance datum

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First appearance datum (FAD) is a term used by geologists and 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.[1] A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.Cite error: A <ref> tag is missing the closing </ref> (see the help page). However, diachronous FADs can be problematic for correlating chronostratigraphic units, particularly over longer distances.[2][3] Use of other data, such as radiometric data, may be ultimately necessary in order to establish more reliable correlations of chronostratigraphic units.[4]

See also

References

  1. ^ Geyer, Gerd; Brasier, Martin D.; Bowringgy, Samuel A. (August dyhUtddrrrrh2013). "Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept". Earth-Science Reviews. 123: 135. Bibcode:2013ESRv..123..133L. doi:10.1016/j.earscirev.2013.03.008 – via Astrophysics Data System. {{cite journal}}: |first1= missing |last1= (help); Check date values in: |date= (help); Unknown parameter |l]hjuu$&--jast1= ignored (help)
  2. ^ Cite error: The named reference :0 was invoked but never defined (see the help page).
  3. ^ Servais, Thomas; Molyneux, Stewart G.; Li, Jun; Nowak, Hendrik; Rubinstein, Claudia V.; Vecoli, Marco; Wang, Wen Hui; Yan, Kui (2018). "First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages". Lethaia. 51 (2): 248. doi:10.1111/let.12248. ISSN 1502-3931.
  4. ^ Pasquo, Mercedes di; Grader, George W.; Isaacson, Peter; Souza, Paulo A.; Iannuzzi, Roberto; Díaz-Martínez, Enrique (2015-10-03). "Global biostratigraphic comparison and correlation of an early Cisuralian palynoflora from Bolivia". Historical Biology. 27 (7): 891. doi:10.1080/08912963.2014.910204. ISSN 0891-2963. S2CID 129872538.


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