The Permian–Triassic (P–Tr or P–T) extinction event, known as the Great Dying, the End-Permian Extinction or the Great Permian Extinction, occurred about 252 Ma (million years) ago. It occurred during the boundary between the Permian and Triassic geologic periods, as well as between the Paleozoic and Mesozoic eras. It is the Earth's most severe known extinction event, with up to 96% of all marine species and 70% of terrestrial vertebrate species becoming extinct. It is the only known mass extinction of insects.
https://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event
GEOCHEMISTRY
27 AUGUST 2018
Earth exhaled, and the ‘Great Dying’ began
Gases from deep in Earth’s crust are implicated in the planet’s worst extinction event.
https://www.nature.com/articles/d41586-018-06062-4
Warming wiped out 95% of marine life 252 million years ago.
https://timesofindia.indiatimes.com/home/environment/global-warming/warming-wiped-out-95-of-marine-life-252-million-years-ago/articleshow/66996707.cms
‘Great Dying’: Biggest ever mass extinction triggered by global warming leaving animals unable to breathe
Study highlights potential for similar event resulting from man-made climate change, scientists say
Josh Gabbatiss
https://www.independent.co.uk/news/science/mass-extinction-great-dying-global-warming-climate-change-oceans-animals-a8671971.html
Tracking evidence of 'The Great Dying'
Dated:
October 29, 2010
Source: University of Cincinnati
Summary: More than 251 million years ago, at the end of the Permian period, Earth almost became a lifeless planet. Around 90 percent of all living species disappeared then, in what scientists have called "The Great Dying." A geologist is presenting his latest findings concerning the ancient catastrophe.
FULL STORY
https://www.sciencedaily.com/releases/2010/10/101028113614.htm
