Each eon is subdivided into eras. The Phanerozoic Eon is divided into the three eras. The oldest is the Paleozoic Era, which ...

They were especially important during the middle Paleozoic era (from the late Middle Ordovician to Devonian), a time marked by a major transition from microbial-dominated to skeletal-dominated ...

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3 min read The Cambrian period, part of the Paleozoic era, produced the most intense ... a wormlike creature that swam in middle Cambrian seas. Fossils found in the Burgess Shale of British ...