Geologic map of North America

This impressively detailed map is the end result of the Geological Society of America's DNAG (Decade of North American Geology) project, and was first published in February 2005.This map marks an immense improvement over previous geology efforts, which were generally compiled before the acceptance of plate tectonics, and when much of the sea floor remained a mystery. Today, with this map, a total of 939 different rock units are accounted for, 142 of which are offshore (a big improvement over older maps, which only distinguished between about 100 rock units, none of which were offshore).

Includes a border on all sides to allow for matting and framing.