This map in the National Atlas of the United States of America illustrates the Geology of the United States. The map shows: * the age, distribution, and character of rocks at or near the land surface; * the ages of sedimentary, volcanic, plutonic, and metamorphic rocks; * bedrock immediately beneath soils or thin surficial deposits; * the thick deposits along the lower Mississippi River, on the Atlantic and Gulf Coastal Plains, and in the deep basins of the western Cordillera; * the limits of continental glaciation; * major faults, impact structures, large volcanic calderas, and many other significant and interesting geologic features. ,,,, This map measures approximately 27" by 31" and is a generalization of a geologic map of North America that was published in 2005 by the Geological Society of America. The majority of the map covers the conterminous portion of the U.S. with insets covering Alaska, Hawaii, and Puerto Rico and the Virgin Islands.
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