Cartographic Resources, Maps, and Spatial Data

Search for geologic or geoscience maps by Keywords, Themes (geologic characteristics), Location (place name, bounding coordinates), Miscellaneous (map scale, publication date, format), or Publisher

Click on any state to be linked directly to the state geologic survey.

The Delaware Geological Survey (DGS) was established by the General Assembly in 1837 and reestablished in 1951. The Survey's mission is, by statute, geologic and hydrologic research and exploration, and dissemination of information through publication and public service.

Archived publications of the Delaware Geological Survey.

The DCNR Bureau of Geological Survey, also known as the Pennsylvania Geological Survey, studies all aspects of the geology of Pennsylvania and makes its findings available to the public.

Includes PDF maps available for download and printed maps available for sale.

The Geologic Atlas of the United States is a set of 227 folios published by the U.S. Geological Survey between 1894 and 1945. Each folio includes both topographic and geologic maps for each quad represented in that folio, as well as description of the basic and economic geology of the area. The Geologic Atlas collection is maintained by the Map & GIS Library within the Texas A&M University Libraries.