THE Mesozoic Era (meso = middle and zoico = life) is marked by the emergence of dinosaurs and comprises the period from approximately 250 to 65 million years ago.
It is divided into three periods, from oldest to most recent: Triassic, Jurassic and Cretaceous.
Its onset is marked by a large mass extinction of unknown causes and the formation and fragmentation of Pangeia. The enhancement and extinction of dinosaurs is also a striking fact of this era called the “age of dinosaurs” because that is when they developed most.
It is also in this Era that the first flowering plants and the first birds appear.
The first Mesozoic Period was the Triassic which stretched from 250 to 205 million years ago. At this time, all continents were clustered on the super continent called Pangeia. Pangeia was surrounded by an ocean called Pantalassa, which corresponds to the current Pacific Ocean and an eastern sea called the Tethys. At the end of the Triassic are found the first mammalian fossils, and on land, several groups of reptiles, including flying, appear, although the fauna of this period is not as diverse as the previous one since there was a large mass extinction in the early Triassic.
In the period Jurassicfrom 205 to 142 million years ago, sea level rises invading the continents. Due to this phenomenon the intracontinental seas (like the Dead Sea) are formed. In this period the fauna once again reaches a very high level of diversity, although not as much as in the Permian (Paleozoic Era).
Marsupials arise, and virtually all modern fish, amphibians, and birds were already present. is also the period known as the “Age of Dinosaurs” due to the predominance of these reptiles in both water, air and land. As for the flora the conifers they were already quite abundant, as were gymnosperms. Angiosperms are also beginning to appear. It is during this period that the separation of the Pangeia that would last 100 million years begins and, it is also in the Jurassic, that the oil reserves.
The last Period of the Mesozoic Era is the Cretaceous extending from 135 to 65 million years. Its end is marked by a new mass extinction that, according to some scientists, was due to the impact of a large meteor that would have caused a drastic climate change by extinguishing the dinosaurs. It was also during this period that the separation of South America and Africa took place and there was no connection between North and South America.