Geologic Maps

Geologic maps show the underlying distribution of geologic features such as fault lines and types of rocks. The geologic features are usually represented by colors, lines, and special symbols printed on top of a regular map called a base map.

Geologic Maps from the U.S. Geological Survey is a simple explanation of how to use a geologic map.

Geologic Atlas of Texas (Bureau of Economic Geology) [Links to price list.]
Available at WILLIS 3FL MAP RESERVE at the Government Documents Service Desk.  Call number TxD Z UA220.7 G292a

Set of individual map sheets showing the geological structure of almost the entire state. Most of the maps come with an accompanying booklet explaining how to interpret the map. If you would like to see the map sheet from the Geologic Atlas of Texas for a specific area, ask at the Government Documents Service Desk. We have an index map to help you determine which sheet you need.

USGS Open-File Reports (U.S. Geological Survey)

Online versions of selected maps and mapping products in the USGS Open-File series (nonpermanent, unpublished manuscript reports, maps, and other material that are made available for public consultation at depositories) from 1970 to the present.

Digital Tectonic Activity Map (NASA)

The Digital Tectonic Activity Map (DTAM) is a new visualization tool for both researcher and educator alike to better understand tectonic activity of our planet for the past 1 million years. DTAM is a Geographical Information System (GIS) that displays a realistic synoptic view of present global tectonism by filling in the cartographic gap between conventional geological maps and plate reconstruction maps.