Geologic Time Scale Page
Precambrian Time- It was 4600 mya, the atmosphere and oceans for oldest rocks form as Earth cools this is what started it and what ended it was volcanic eruptions. The organisms that were dominant were bacteria and algae.
Paleozoic Era- It was 570 mya, What started it was the evolution of bacteria to fish and marine animals that started it, but what finished it was an explosion. The dominant life forms of this era was marine animals.
Mesozoic Era- It started 245 mya. After he explosion the remaining marine animals started evolving into reptiles/land animals. What ended it was the impact of an Asteroid. The dominant life form was reptiles.
Cenozoic Era- 65.5 mya to present day. After the extinction of the reptiles the first mammals started appearing then evolved from that to other mammals like humans. And nothing has ended us yet.
We live in the Phanerozoic Eon, the Cenozoic Era, Quaternary Period, and the Holocene epoch.
Paleozoic Era- It was 570 mya, What started it was the evolution of bacteria to fish and marine animals that started it, but what finished it was an explosion. The dominant life forms of this era was marine animals.
Mesozoic Era- It started 245 mya. After he explosion the remaining marine animals started evolving into reptiles/land animals. What ended it was the impact of an Asteroid. The dominant life form was reptiles.
Cenozoic Era- 65.5 mya to present day. After the extinction of the reptiles the first mammals started appearing then evolved from that to other mammals like humans. And nothing has ended us yet.
We live in the Phanerozoic Eon, the Cenozoic Era, Quaternary Period, and the Holocene epoch.