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Former good article nominee Extinction was a Natural sciences good articles nominee, but did not meet the good article criteria at the time. There are suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.
May 21, 2012 Good article nominee Not listed

State consistently whether extinction is or isn't defined to include pseudoextinction[edit]

Is pseudoextinction a special case of extinction, or are they mutually-exclusive in a given case?

The pseudoextinction section suggests the former as it begins with:

Descendants may or may not exist for extinct species.

Which implies that a pseudoextinct species (which by definition must have existing descendants) can indeed be considered extinct.

But, inconsistent with that, there are phrases elsewhere that appear to assume that a species can be pseudoextinct and not be considered extinct:

"pseudoextinct, rather than extinct"
"Pinpointing the extinction (or pseudoextinction)"

So which is it: is a pseudoextinct species also considered extinct, or not, or is the answer controversial, or, worse yet, context-dependent? The word pseudoextinct can be read literally (or at least etymologically) as "falsely extinct", so how can it be that a "falsely extinct" species is also (truly) extinct? :-) But are there any good citations on one or both sides of this question?

DavRosen (talk) 16:17, 20 June 2013 (UTC)i eat them

Needs a section[edit]

Hi, this is my first time looking at this article. I noticed that humans are mentioned under the "causes" section although it seems somewhat unorganized. I think there should be a separate section devoted to human activities such as poaching. Poaching (and/or human activities) should have its own section I think. --Turn685 (talk) 09:45, 25 January 2014 (UTC)

Capitalisation of conservation statuses[edit]

Please see the ongoing discussion on Talk:Conservation status#Capitalisation of conservation statuses.
Coreyemotela (talk) 14:22, 1 June 2014 (UTC).

Lazarus taxa[edit]

It doesn't describe what Lazarus taxa are. This should be clarified.Greeninventor999 (talk) 06:10, 7 January 2016 (UTC)

Text from lead[edit]

Not really sure why this was in the lead. Stashing it here if anyone wants it. Sizeofint (talk) 02:33, 2 June 2016 (UTC)

The age of the Earth is about 4.54 billion years.[1][2][3] The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago,[4][5][6] during the Eoarchean Era after a geological crust started to solidify following the earlier molten Hadean Eon. There are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia.[7][8][9] Earlier physical evidences of life include graphite, a biogenic substance, in 3.7 billion-year-old metasedimentary rocks discovered in southwestern Greenland,[10] as well as, "remains of biotic life" found in 4.1 billion-year-old rocks in Western Australia.[11][12] According to one of the researchers, "If life arose relatively quickly on Earth ... then it could be common in the universe."[11]


  1. ^ "Age of the Earth". U.S. Geological Survey. 1997. Archived from the original on 23 December 2005. Retrieved 2006-01-10. 
  2. ^ Dalrymple, G. Brent (2001). "The age of the Earth in the twentieth century: a problem (mostly) solved". Special Publications, Geological Society of London. 190 (1): 205–221. Bibcode:2001GSLSP.190..205D. doi:10.1144/GSL.SP.2001.190.01.14. 
  3. ^ Manhesa, Gérard; Allègre, Claude J.; Dupréa, Bernard & Hamelin, Bruno (1980). "Lead isotope study of basic-ultrabasic layered complexes: Speculations about the age of the earth and primitive mantle characteristics". Earth and Planetary Science Letters. 47 (3): 370–382. Bibcode:1980E&PSL..47..370M. doi:10.1016/0012-821X(80)90024-2. 
  4. ^ Schopf, JW, Kudryavtsev, AB, Czaja, AD, and Tripathi, AB. (2007). Evidence of Archean life: Stromatolites and microfossils. Precambrian Research 158:141–155.
  5. ^ Schopf, JW (2006). Fossil evidence of Archaean life. Philos Trans R Soc Lond B Biol Sci 29;361(1470) 869-85.
  6. ^ Hamilton Raven, Peter; Brooks Johnson, George (2002). Biology. McGraw-Hill Education. p. 68. ISBN 978-0-07-112261-0. Retrieved 2013-07-07. 
  7. ^ Borenstein, Seth (13 November 2013). "Oldest fossil found: Meet your microbial mom". AP News. 
  8. ^ Pearlman, Jonathan (13 November 2013). "'Oldest signs of life on Earth found' – Scientists discover potentially oldest signs of life on Earth – 3.5 billion-year-old microbe traces in rocks in Australia". The Telegraph. London. Retrieved 2014-12-15. 
  9. ^ Noffke, Nora; Christian, Daniel; Wacey, David; Hazen, Robert M. (8 November 2013). "Microbially Induced Sedimentary Structures Recording an Ancient Ecosystem in the ca. 3.48 Billion-Year-Old Dresser Formation, Pilbara, Western Australia". Astrobiology (journal). 13 (12): 1103–24. Bibcode:2013AsBio..13.1103N. doi:10.1089/ast.2013.1030. PMC 3870916Freely accessible. PMID 24205812. 
  10. ^ Ohtomo, Yoko; Kakegawa, Takeshi; Ishida, Akizumi; et al. (January 2014). "Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks". Nature Geoscience. London: Nature Publishing Group. 7 (1): 25–28. Bibcode:2014NatGe...7...25O. doi:10.1038/ngeo2025. ISSN 1752-0894. 
  11. ^ a b Borenstein, Seth (19 October 2015). "Hints of life on what was thought to be desolate early Earth". Excite. Yonkers, NY: Mindspark Interactive Network. Associated Press. Retrieved 2015-10-20. 
  12. ^ Bell, Elizabeth A.; Boehnike, Patrick; Harrison, T. Mark; et al. (19 October 2015). "Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon" (PDF). Proc. Natl. Acad. Sci. U.S.A. Washington, D.C.: National Academy of Sciences. 112: 14518–21. doi:10.1073/pnas.1517557112. ISSN 1091-6490. PMC 4664351Freely accessible. PMID 26483481. Retrieved 2015-10-20.  Early edition, published online before print.