A Mesozoic includes triplet geological periods: from either oldest to immature, it is a Triassic, the Jurassic and the Cretaceous periods. It extended from either about 251 million years ago (Ma) to roughly 65 Ma. A Mesozoic followed a Paleozoic Era and preceded a Cenozoic Era. A moo (oldest) boundary is placed per Permian extinction. A upper (immature) boundary is placed at a Cretaceous extinction.

A Mesozoic spans a time period whilst terrestrial life was dominated by big sophisticated reptiles, a basis for its popular designation when "the Age of the Dinosaurs". A era as well found a development of early birds and mammals, and of the number one flowering plants (angiosperms). At a prevent of the Mesozoic, all the major system plans of modern life were around situ although in occasionally events—notably a mammalian—a forms that existed at a prevent of the Cretaceous period were comparatively primitive.

Geologically, a Mesozoic starts using well-nigh all the Globe's land surface collected into the supercontinent known as Pangaea. When you took the Mesozoic Era, still, Pangaea split into a northern continent Laurasia and a southern celibate Gondwana. Laurasia later on divided into North America and Eurasia, whilst Gondwana broke higher increasingly into a foursome present continents of South America, Africa, Australia and Antarctica.