The Paleozoic Era is a geological era that started 550mya and finished 250mya, encompassing the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian geological periods. It is the earliest geological era, marked in the beginning by the emergence of soft shelled life, and near the end of the Era, marked by complex plants (first modern ones), insects, fish and small reptiles. Vast forests of early plants left Coal deposits in North America and Europe. Sea levels reacted ~200m higher than today, due to the warmer climate at the end of the period. The climate was likely moderate at the start of the era, but due to continental drift; became much warmer in come places and much colder in areas where life was located. This era was ended by the greatest known mass extinction in history.
|A brief history of Geologic time|