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Crinoid USA F2834
The Permian is a geologic period that lasted from 299 to 252 million years ago. Further development of many reptiles and mollusks. The first Gingko-like trees occur. The number of amphibians and insects decreased. The primitive armored fish became extinct. At the end of the Permian there was a large mass extinction after which the number of species decimated. The cause of this mass-extinction is still not clear. Among other the last Trilobites became extinct.
Position of the Permian in the geological timescale
See also the article about the Geological Timescale.
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