Paleozoic
Videos
The Paleozoic Era is the first of three geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago, it succeeds the Neoproterozoic and ends 251.9 Ma at the start of the Mesozoic Era. Th
Trilobites
Cephalaspis (a jawless fish)
Eogyrinus (an amphibian) of the Carboniferous
Life in the early Paleozoic
Mesozoic
Videos
The Mesozoic Era is an era of Earth's geological history, lasting from about 252 to 66 million years ago, comprising the Triassic, Jurassic and Cretaceous Periods. It is characterized by the dominance
Paleozoic
…Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Era. The Paleozoic is subdivided into six geologic periods, (from oldest to youngest) Cambrian, Ordovician, Silurian, Devonian, Carboniferous and…
Plateosaurus (a prosauropod)
Sericipterus
Stegosaurus
Tylosaurus (a mosasaur) hunting Xiphactinus