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Geologic Timeline - (Earth's Life Cycle)
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GEOLOGIC TIMELINE
Archean eon
The Hadean Eon
Archean Eon
Hadean eon
Mesozoic Era
PAleozoic Era
Cenozoic Era
Life
The first signs of life for 4.4 billion years ago called protobionts (split to reproduce) and at some point a copying error gave rise to DNA as we know it. Technically not considered life because of the fact that they were more like phospholipids.
- Archean eon: Lasted 2.5 billion years(first of three eons in earths current history)
- Older form of Archaea was made somewhere from 3.9-3.5 billion years ago.
- Prokaryotes in the Achaean eon lived alone on our planet with little to no change from 3.5 billion years ago to 2.1 billion years ago.