Permian–Triassic extinction event

Extinction intensity.svgCambrianOrdovicianSilurianDevonianCarboniferousPermianTriassicJurassicCretaceousPaleogeneNeogene
Marine extinction intensity in the Phanerozoic
Millions o years aby
Extinction intensity.svgCambrianOrdovicianSilurianDevonianCarboniferousPermianTriassicJurassicCretaceousPaleogeneNeogene
Plot o extinction intensity (percentage o marine genera that are present in ilk interval o time but dae nae exist in the follaein interval) vs time in the past.[1] Geological periods are annotatit (bi abbreviation an colour) abuin. The Permian–Triassic extinction event is the maist signeeficant event for marine genera, wi juist ower 50% (accordin tae this soorce) perishin. (soorce an eemage info)

The Permian–Triassic extinction event, an aw kent as the P–Tr extinction,[2] the P–T extinction,[3] the End-Permian Extinction[4] an colloquially as the Great Deein,[5] formed the boondary atween the Permian an Triassic geologic periods, as weel as atween the Paleozoic an Mesozoic eras, approximately 252 million years aby.


  1. Rohde, R.A. & Muller, R.A. (2005). "Cycles in fossil diversity". Nature. 434 (7030): 209–210. Bibcode:2005Natur.434..208R. doi:10.1038/nature03339. PMID 15758998.
  2. Dirson Jian Li (18 December 2012). "The tectonic cause of mass extinctions and the genomic contribution to biodiversification". Quantitative Biology.
  3. Algeo, Thomas J. (5 February 2012). "The P-T Extinction was a Slow Death". Astrobiology Magazine.
  4. ""Great Dying" lasted 200,000 years". National Geographic. 23 November 2011. Retrieved 1 April 2014.
  5. St. Fleur, Nicholas (16 February 2017). "After Earth's worst mass extinction, life rebounded rapidly, fossils suggest". The New York Times. Retrieved 17 February 2017.