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Geologic time scale
Geo
7
Geology
Undergraduate 2
09/17/2013
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Term
All the divisions are based in changes in:
 Definition
Biological life
Term
Eons
 Definition
Largest units of geologic time
Term
Hadean
 Definition

4.5-3.8 Gazillion years ago

Earth was like Hell

Before a solid crust

Still under construction
Term
Archean
 Definition

3.8-2.5 Gazillion years ago

Ancient time

Continental crust not differentiated
Term
Proterozoic
 Definition

2.5-0.54 Ga

Before life
Term
Phanerozoic
 Definition

0.54 Ga to present

Visible life

Emergence of hard bodied macro fossils
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