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The Cambrian Period witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms.
Earthâs History 371 Early Paleozoic Life Life in early Paleozoic time wasrestricted to the seas. Ve rtebrates had not yet evolved,so life consistedof several invertebrate groups. The Cambrian period was the goldenage of trilobites. More than 600 types of these mud-burrowing scav-engers flourished worldwide.arly Paleozoic History During the Cambrian,Ordovician,and Silurian periods,the vast southern continent of Gondwana encom-passed ï¬ve continents (South America, Africa, Australia, Antarctica,India, and perhaps China). North America and several other landmasses were not part ofGondwana.