Question

When did the following eon or era begin:-
1. Archean
2. Silurian
3. Triassic
4. Jurassic
5. Cretaceous.

Answer quickly and correctly​

Answer 1

Answer:

Archean begins 4.6 billion years ago.

Silurian begins 443 million years ago.

Triassic begins 252 million years ago.

Jurassic begins 199.6 million years ago.

Cretaceous begins 145 million years ago.