This map provides a picture of the nation's geologic basement. More than 80 pieces of crust have been added to the nation's basement since the Earth began preserving crust about 3.6 billion years ago.

CU Boulder acknowledges that it is located on the traditional territories and ancestral homelands of the Cheyenne, Arapaho, Ute and many other Native American nations. Their forced removal from these ...

A map showing the many different pieces of Earth's crust that comprise the nation's geologic basement is now available from the U.S. Geological Survey. This is the first map to portray these pieces, ...