The Age of Dinosaurs is divided into the Triassic, Jurassic and Cretaceous three phases, the specific introduction is as follows:
1, the Triassic period: about 250 million years ago to 200 million years ago, the groove tooth reptiles slowly developed into the earliest dinosaurs, to the late Triassic period, the dinosaurs have been a wide variety of groups, known as "the dawn of the dinosaurs! "The Triassic period ended with an extinction event. The Triassic period ended with an extinction event that wiped out many of the groove-toothed animals as well, but provided the dinosaurs with a tremendous opportunity to develop.
2. Jurassic: about 199.6 million years B.C. (error value of 600,000 years) to 145.5 million years (error value of 4 million years). The pre-Jurassic period, because of the experience of mass extinction, so a variety of plants and animals are very rare (belong to the rest and recuperation stage), but the dinosaurs totaled a branch, waiting for the opportunity to dominate the land. After the middle and late Jurassic, dinosaurs ruled the earth for 150 million years.
3, Cretaceous: began 145 million years ago, ended 66 million years ago. Cretaceous dinosaur species reached its heyday, the most famous is Tyrannosaurus rex, the end of the Cretaceous period, a major extinction event in the surface of the dominant reptiles disappeared in large quantities, the dinosaurs are completely extinct, mammals through the crisis, and occupied by the dinosaurs and other reptiles out of the ecological environment, the rapid evolutionary development of the new rulers.
Expanded Information
Discovery of Dinosaurs
Dinosaurs is a class of reptiles appeared in the Mesozoic period of the general term, athletic limbs, long tail and a huge body is the most of the dinosaurs portrayed. They mainly inhabited the lakeshore plain (or coastal plain) on the forested land or open areas. Dinosaurs were diverse and varied greatly in size and habits, with the largest, the fragile Double-Cavity Dinosaur, possibly exceeding 50 meters, while the smallest, the Hummingbird, may have been less than 10 centimeters.
It wasn't until the 1 9th century that it was known that dinosaurs once existed on Earth. The first person to discover a dinosaur fossil was a British physician named Gideon Mantell, and it was British paleontologist Chad Owen who coined the term dinosaur.
Baidu Encyclopedia - Triassic Period
Baidu Encyclopedia - Jurassic Period
Baidu Encyclopedia - Cretaceous Period