Skip to main content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Geologic Maps at the UNT Libraries and on the Internet
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 Atlas of Texas
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. Maps can be purchased online from the Bureau of Economic Geology
Digital Tectonic Activity Map
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.
Geologic Maps of US States
Digital geologic maps of the US states with consistent lithology, age, GIS database structure, and format
Geology of the Conterminous United States
A digital version of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii.
USGS Open-File Reports
Online versions of selected maps and mapping products in the USGS Open-File series (nonpermanent, unpublished manuscript reports, maps, and other material that are made available for public consultation at depositories) from 1970 to the present.
Texas Geologic Map Data
A GIS database of geologic units and structural features in Texas, with lithology, age, data structure, and format written and arranged just like the other states
General Geologic Map of the World
World geology compiled by the Geological Survey of Canada at approximately 1:35,000,000 scale, published there as Open File Report 2915
Simple explanation from the U.S. Geological Survey of what geologic maps are and how to use them.
GIS Data from the World Petroleum Assessment
Includes geologic units and structural features at a broad scale for continents outside North America.
An international effort to improve the availability and integration of world geologic map data.