Mesozoic Era

Siobhan O'Leary

The Mesozoic Era had occurred about 252-65 million years ago, after the Paleozoic Era and before the Cenozoic Era. The Mesozoic Era is commonly known as the Dinosaur Age. There are three geological periods; Triassic, Jurassic, and Cretaceous.

Organisms of the Era

Many of the organisms in this era are plants, insects, reptiles, mammals, dinosaurs, all sorts of stuff like that. Both mammals and dinosaurs had first appeared in the late Triassic, while both were roaming about, dinosaurs became dominant of the remaining periods and the mammals stayed small later in the Mesozoic.

One commonly known dinosaur is the Tyrannosaurus Rex (T-Rex), a carnivorous reptile who was pretty much the main predator. Another dinosaur is the Triceratops.

The Mesozoic Enviorment

The Mesozoic had been hot and arid until around the Jurassic period, when it got warm and moist. During the Cretaceous, the earth had cooled down a little bit and the poles and glaciers were forming again. Of course, the temperatures back then were higher, because of their carbon dioxide levels in the air.
Iguanodon-A herbivore as long as a bus


Since Pangaea had formed in the late Paleozoic, it started breaking apart early in the Mesozoic Era. Near the ending of the era, North America, India, and Africa had been formed, and the Atlantic Ocean was still spreading as continents spread apart.

How did it end?

The Mesozoic Era had ended because of the impact an asteroid caused. This is one of the theories of why the dinosaurs went extinct.

After the asteriod, the air, climate, envoirment was different, so a new way of life was brought upon the earth.