Geologic Time Scale
1
First Fossils ~ 3.5 Ga Archean Algae (??)
2
Modern Stromatolites at Shark Bay, Western Australia
3
2.7 Ga Stromatolites from Australia
4
2.5 Ga. BIF - Banded Iron Formation
5
The Formation of BIFs
6
2.3 Ga - The Beginning of Continental Redbeds
7
Paleoproterozoic Laurentia
8
Mesoproterozoic Laurentia
9
Neoproterozoic Laurentia
10
End of the Proterozoic Eon - 541 Ma.
11
1.8 Ga. Nuna or Columbia Supercontinent ???
12
Supercontinent Rodinia - 750 Ma
13
Supercontinent Pannotia
14
A Valley (Alpine) Glacier
15
Glacier forming Till
16
Glacial Tillite
17
Snowball Earth (900 and 600 Ma)
18
1.1 Ga Midcontinental Rift of Laurentia
19
Leaving the Proterozoic Eon
20
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