Paleogeography of North America Images by: Dr. Ron Blakey Professor of Geology Northern Arizona University
2 Late Precambrian 550 Ma (Million Years Ago):
3 Middle Cambrian 510 Ma:
4 Late Cambrian 500 Ma:
5 Early Ordovician 485 Ma:
6 Middle Ordovician 470 Ma:
7 Late Ordovician 450 Ma:
8 Early Silurian 430 Ma:
9 Late Silurian 420 Ma:
10 Early Devonian 400 Ma:
11 Middle Devonian 385 Ma:
12 Late Devonian360 Ma:
13 Early Mississippian 345 Ma:
14 Late Mississippian 325 Ma:
15 Early Pennsylvanian 315 Ma:
16 Late Pennsylvanian 300 Ma:
17 Early Permian 290 Ma:
18 Middle Permian 275 Ma:
19 Late Permian 260 Ma:
20 Early Triassic 245 Ma:
21 Middle Triassic 230 Ma:
22 Late Triassic 210 Ma:
23 Early Jurassic 195 Ma:
24 Early Jurassic 180 Ma:
25 Middle Jurassic 170 Ma:
26 Late Jurassic 150 Ma:
27 Early Cretaceous 140 Ma:
28 Early Cretaceous 130 Ma:
29 Early Cretaceous 115 Ma:
30 Late Cretaceous 100 Ma:
31 Late Cretaceous 85 Ma:
32 Late Cretaceous 75 Ma:
33 Cretaceous-Tertiary 65 Ma:
34 Paleogene Paleocene 60 Ma:
35 Paleogene Eocene 50 Ma:
36 Paleogene Eocene 40 Ma:
37 Paleogene Oligocene 25 Ma:
38 Neogene Miocene 15 Ma:
39 Neogene Miocene 8 Ma:
40 Neogene Pliocene 3 Ma:
41 Quaternary Glacial 126,000 Years Ago:
42 Present:
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