Different Views on the End-Permian Mass Extinction
The End-Permian mass extinction was huge, the largest of the five major mass extinctions on the geological time scale. It happened approximately 245 million years ago and eliminated approximately fifty-four percent of marine families and possibly almost ninety-six percent of all marine species (Erwin, 69). Brachiopods, bryozoans, and stalked echinoderms were hit incredibly hard by the extinction by the bivalve and gastropod mollusks were hit reasonably hard (Stanley, 418). There are many theories that suggest what may have happened to cause the end-Permian mass extinction but it has not been unanimously decided among scientists what really happened. I have studied articles written by various people that discuss what they believe to have been the cause. There articles contain some types of evidence to back up their theories but there may not be enough evidence to confidently say that their theory is the right one. The possible theories for extinction remain somewhat constant through the essays I have read. Regardless of what one author believes is true, they typically mention other theories and how they could also be a possibility. There are five
Stanley wrote that it is possible that the extinction happened within one million years which disagrees with Erwin’s argument that the extinction lasted five to eight million years. Georgina Hickey with co-author of Mother of Mass Extinctions, Abbie Thomas also stated in their article that in took less than one million years for the According to Steven Stanley, the author of Earth System History, there were two extinctions. The First Extinction and the Terminal Extinction. He wrote that the First The repeated association during the late Neoproterozoic Era of extinction to take place. Therefore the amount of time the extinction took is in disagreement among authors with theories as to the cause of the End-Permian mass extinction.
Some topics in this essay:
Extinction End-Permian,
Mass Extinction,
Richard Twitchett,
Terminal Extinction,
Canfield Grotzinger,
Douglas Erwin,
Wignall Twitchett,
Richard Kerr’s,
Neoproterozoic Era,
Abbie Thomas,
mass extinction,
end-permian mass,
end-permian mass extinction,
marine organisms,
evidence found,
cause end-permian,
cause end-permian mass,
sea level,
cause extinction,
flood basalt siberia,
wignall twitchett,
anoxia cause,
killed marine,
rise sea level,
knoll bambach canfield,
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Approximate Word count = 1122
Approximate Pages = 4 (250 words per page double spaced)
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