The Map and Geospatial Hub holds geologic maps from USGS and the Arizona Geological Survey. The Hub's maps cover most of the U.S. and many other countries.
Search for maps in the ASU Library Catalog using the advanced search. Use search terms such as the name of the city, county, or region with the term "geology."
For geologic maps click on MapView. System shows a map of the United States with overlays of geologic maps from USGS and State Geological Surveys for available.
Search the Map Catalog for additional maps not on the Map View.
For topographic maps click on TopoView. Click on an area on the map and you can view historic and current maps in various scales. Download any map for free.
Click on any page for help.
Geologic Map in the National Atlas
A USGS circular: "About the Geologic Map in the National Atlas of the United States of America"