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The Capitanian Extinction Event
5
Part B
Presented by:
- Benjamin Kofa Fyneah
- Dorsa Tafazzoli
Topic
“The Capitanian began on a high note, with tropical reefs and a diverse dinocephallian therapsid fauna, but quickly changed with a mass extinction. It was introduced in 1904 by George Burr Richardson, and was added to the internationally used ISC timescale in 1961. The Capitanian is relatively the oldest and most complex stage of the molluscs, which includes the ammonite stage Timorites and the conodont biozones Clarkina postbitteri hongshuiensis and Jinogondolella postserrata” (Alan Kazlev, 2002).
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(David P.G. Bond, Stephen E. Grasby, 2017, p.16)
*Image2 - Volcano: source: (Ravilious, 2016)
A causal role for marine anoxia in the Capitanian extinction has been suggested, in which mollusks replaced the brachiopods as the dominant shelly benthos. Anoxia kills benthos, but dysoxia is the likely kill mechanism in the Boreal Realm. (David P.G. Bond et al, 2019, p. 938)
Video source - (Geo Beats, n.d.)
Bibliography:
David P.G. Bond, Paul B. Wignall, Stephen E. Grasby; The Capitanian (Guadalupian, Middle Permian) mass extinction in NW Pangea (Borup Fiord, Arctic Canada): A global crisis driven by volcanism and anoxia. GSA Bulletin 2019;; 132 (5-6): 931–942. doi: https://doi-org.myaccess.library.utoronto.ca/10.1130/B35281.1
David P.G. Bond, Jason Hilton, Paul B. Wignall, Jason R. Ali, Liadan G. Stevens, Yadong Sun, Xulong Lai, The Middle Permian (Capitanian) mass extinction on land and in the oceans, Earth-Science Reviews, Volume 102, Issues 1–2, 2010, Pages 100-116, ISSN 0012-8252, https://doi.org/10.1016/j.earscirev.2010.07.004.
\Ravilious, K. (2016, September 19). Megavolcanoes on supercontinents obliterated life. Retrieved from https://cosmosmagazine.com/earth/earth-sciences/megavolcanoes-on-supercontinents-obliterated-life/
David P.G. Bond, Stephen E. Grasby, On the causes of mass extinctions, Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 478, 2017, Pages 3-29, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2016.11.005.
Alan Kazlev, M. (2002, May 20). Palaeos Paleozoic: Permian: The Capitanian age. Retrieved from https://palaeos.com/paleozoic/permian/capitanian.html
Video Link: Geo Beats. (n.d.). Sixth mass extinction recognized by scientists - video Dailymotion [Video]. Retrieved from https://www.dailymotion.com/video/x2njko9