Best answer: Jurassic period. Jurassic is a geological age, which is bounded between Triassic and Cretaceous, from about 199.6 million years BC (with an error value of 600,000 years) to 145.5 million years BC (with an error value of 4 million years). It is the second period of Mesozoic era, which began with Jurassic extinction in Triassic.
One hundred and fifty million years ago was Jurassic period, and Jurassic (Jurassic) was a geological age, which was between Triassic and Cretaceous, from about 199.6 million years BC (with an error value of 600,000 years) to 145.5 million years BC (with an error value of 4 million years). Jurassic is the second period of Mesozoic, which started from Triassic-Jurassic extinction event. Although the rock marks of this period are very obvious and clear, the exact time of its start and end, like other ancient geological times, cannot be determined very accurately.
The name of Jurassic originated from Jura Mountain at the border between Switzerland and France, and was put forward by French paleontologist A. Browniar in 1829. In 1837, L. von Buhe divided the Jurassic in southern Germany into three parts: lower part, middle part and upper part. In 1843, the Federal Aviation Administration Quinstedt called the lower black marl black Jurassic, the middle brown iron limestone brown Jurassic and the upper white marl white Jurassic. Jurassic is divided into three periods: early, middle and late.
Jurassic was named by Alexander Brongniart, and its name was taken from Jura Mountain on the border of Germany, France and Switzerland. There are many large-scale outcrops of marine limestone in Jura Mountain.
In the early Jurassic, because of the great extinction, all kinds of animals and plants were very rare (which belongs to the stage of recuperation), but the dinosaurs always stood out and waited for opportunities to dominate the land. After the middle and late Jurassic, dinosaurs became the most prosperous dominant species on the earth, and then they ruled the earth for 150 million years until the Cretaceous-Tertiary extinction event.