What three periods did ancient dinosaurs go through?

1, Triassic

Triassic (English: Triassic) is the geological age of 250 million to 200 million BC, between Permian and Jurassic, and it is the first period of Mesozoic. The beginning and end of Triassic was marked by an extinction event.

2. Jurassic

Jurassic is a geological age, between Triassic and Cretaceous, which is about 654.38+099.6 million years BC (with an error of 600,000 years) to 654.38+045.5 million years BC (with an error of 4 million years).

3. Cretaceous

Cretaceous (English: Cretaceous) is the last period of Mesozoic geological age, which started 65.438+0.45 billion years ago and ended 66 million years ago, lasting 79 million years. This is the longest stage of Phanerozoic.

Extended data:

The Mesozoic era spanned 65.438+0.8 billion years from 252 million years ago to 66 million years ago, from the beginning of the Permian-Triassic extinction event to the end of the Cretaceous-Tertiary extinction event. Mesozoic can be divided into the following three periods:

Triassic: 250 million years ago to 200 million years ago Jurassic: 200 million years ago to 65.438+45 million years ago Cretaceous: 65.438+45 million years ago to 66 million years ago.

The lower limit of Mesozoic is the Permian-Triassic extinction event, which wiped out 90% to 96% of marine life and 70% of terrestrial life at that time, and it was also the most serious extinction event in the history of biological evolution.

The upper limit of Mesozoic is Cretaceous-Tertiary extinction event, which may be caused by the collision event of Heksulubo in Yucatan Peninsula. This extinction event led to the disappearance of 50% species at that time, including all non-bird dinosaurs.

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