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