Humboldt State UniversityNatural History Museum

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Plate Tectonic Reconstructions: Ordovician Period

Early Ordovician

These maps of major tectonic elements (plates, oceans, ridges, subduction zones, mountain belts) are used with permission from Dr. Ron Blakey at Northern Arizona University. The positions of mid-ocean ridges before 200 Ma are speculative. Click here for an explanation of map symbols.

Additional maps and Paleogeographic globes are available at Dr. Blakey's Library of Paleogeography site.

Cambrian Maps

Ordovician Period

Silurian Maps

© 1999 HSU NMH | Last modified 28 October 2012