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The middle era of the Phanerozoic Eon, from 251 to 65.5 million years ago. Divided into Triassic, Jurassic and Cretaceous periods. Often called the "Age of Reptiles"/"Age of Dinosaurs"[1].


  1. ^ Holtz, Dr. Thomas Jr.; Luis V. Rey (2007). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages. Random House. ISBN 9780375824197.  Cite uses deprecated parameter |coauthor= (help)
Anatomy of an amiotic egg This article is part of Project Glossary, an All Birds project that aims to write comprehensive articles on each term related to animals.

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