There are two major schools of thought that can provide two entirely different answers to this subject. See the discussion section below for a Creationist's point of view on this answer.
Anyone knowing the current scientific answer to this can feel free to finish off this answer.
The Rocky Mts. Formed and Pangea started to break apart
Two major eras that ended with mass extinctions are the Permian-Triassic extinction event, which marked the end of the Permian period, and the Cretaceous-Paleogene extinction event, which marked the end of the Cretaceous period. These events had profound impacts on life on Earth, leading to the loss of a significant number of species.
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The Age of Reptiles occurred during the Mesozoic Era. This era is subdivided into three periods: the Triassic, Jurassic, and Cretaceous. The Age of Reptiles was characterized by the dominance of dinosaurs and other prehistoric reptiles.
It began when pizza was born...
roughly 250 million years ago.
http://en.wikipedia.org/wiki/Mesozoic Btw, it's not the Mesozoic "area" but the Mesozoic era. Hope this was helfpul!
The Paleozoic precedes the Mesozoic. And our current era, the Cenozoic, follows the Mesozoic.
Paleozoic - climate change Mesozoic - meteor
The Paleozoic came before the Mesozoic.
Mesozoic Era
The Mesozoic Era is known as the Age of Reptiles.
mesozoic
The Cenozoic era was not a subdivision of the Mesozoic era. The Mesozoic era is subdivided into the Triassic, Jurassic, and Cretaceous periods.
Events during the Mesozoic include the increasing dominance of dinosaurs. The Mesozoic is marked by the appearance of flowering plants.
The dinosaurs lived in the Mesozoic Era, which includes the Triassic, Jurassic, and Cretaceous periods. The first dinosaurs appeared in the late Triassic and went extinct at the end of the Cretaceous.