3 min read The Cambrian period, part of the Paleozoic era, produced the most ... first arose about 545 million years ago in the early Cambrian and thrived throughout the world's oceans until ...

The Devonian, part of the Paleozoic era, is otherwise known as the Age of ... jaws lined with bladelike plates that acted as teeth. Early placoderms fed on mollusks and other invertebrates ...

the emergence and proliferation of early animals from the late Neoproterozoic to the early Paleozoic era (~600–500 million years ago or mya) has traditionally been attributed to a significant ...

Titled "Ancient Life," it tells the story of what life was like in what is now New Mexico 300 million years ago in the Paleozoic Era, when it was near the Equator, next to multiple seas ...

After Keppie (2000). The Appalachian orogen of North America is divisible with some controversy into five tectonolithologic zones which range in age from Late Precambrian through the Early Paleozoic ...