Mass Extinction By: Emmarie Campbell

Cretaceous Extinction

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They are famed for the death of dinosaurs. However, many other organisms perished at the end of the Cretaceous including the ammonites, many flowering plants and the last of the pterosaurs.

Triassic Extinction

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In the last 18 millions years in the Triassic period there were two or three phases of extinction whose combined effects created the Triassic-Jurassic mass extinction event. Many different animals died out, including marine reptiles, some large amphilbians, many reef-building creatures and large numbers cephalopod mollusces.

Permain Extinction

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A series of extinction pulses that contributed to the greatest mass extinction in Earthś history. Scientist say that permian exinction occured over the course of 15 million years during the latter part of the permain period.

Devonian Extinction

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The Devonian Extinction, a series of several global extinction events primarily affecting the marine communities of the Devonian period, At present it is not possible to connect this series with just a single cause.

Ordovician Extinction

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This extinction is currently being studied. The most commonly accepted theory they were triggered by the onset of long ice, perhaps the most severe glacial age of the Phanerozoic, in the Hirnantian faunal stage that ended the long, stable greenhouse conditions typical of the ordovician. This event preceded as the fall in atmospheric CO2, which selectively affected the shallow seas where the organisms lived. This accured about 445.2 millions years ago.