Paleozoic Era

Paleozoic Era covers the time period between 541 and 252 million years ago.

It covers the geological time periods of Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.

It started with the Cambrian Period and the so called Cambrian Explosion - and ended with the Permian Extinction.
Three Estemmenosuchus Mirabilis Face Off in a Paleozoic Lake
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It was the era during which the first fish, amphibians and reptiles evolved.

It was also when the life moved onto the land.

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