Home | Exhibits | Life Through Time Exhibit | Ordovician | Plate Tectonic Reconstructions
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.
© 1999 HSU NMH | Last modified 28 October 2012