Yellowstone Caldera map2.jpg. United States Geological Survey. 16 February 2006. Wikimedia Commons [database online], [cited 1 February 2013] Available from Wikimedia Commons.
Location
Brinkerhoff Geology Library Map Room
Scope
Geological Maps are published by the Federal Government (USGS), state geological surveys, and professional societies. The Library focuses collection efforts on Wyoming and the Rocky Mountain region. The USGS publishes geological maps of all states and many countries.
Finding Geological Maps
Many state geological surveys have maps available for download on their websites at no charge. The Geology Library also owns many maps from state surveys.