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Geology & Soils

USGS Geologic Maps

USGS geologic maps provide official rock type, fault, and structural geology data for the United States, accessible through the National Geologic Map Database and state-level digital datasets.

Format Shapefile / GeoPDF / GeoTIFF
Coverage United States
Resolution Varies by map scale (1:24k to 1:2.5M)
License Public domain (US government)
Update Irregular (mapping campaigns)
Download source Open official source

Format

Shapefile / GeoPDF / GeoTIFF

Geometry

Mixed (polygons, lines)

Coverage

United States

Resolution

Varies by map scale (1:24k to 1:2.5M)

About this dataset

US Geological Survey state and national geologic maps showing rock types, faults, and structural geology for the United States.

The USGS provides geologic maps at state and national scales showing the distribution of rock types, faults, folds, and other structural features. The National Geologic Map Database (NGMDB) catalogs over 90,000 geologic maps, while the USGS also offers digital geologic map datasets for GIS use.

Geologic mapping Mineral exploration Engineering geology

How to download

  1. 1 Open the NGMDB catalog search page.
  2. 2 Search by state, quadrangle, or keywords to find geologic maps.
  3. 3 Select the desired map and download the digital GIS dataset or GeoPDF.
  4. 4 Open the data in GeoDataViewer or QGIS for geologic analysis.

National Geologic Map Database (NGMDB)

Search and access 90,000+ geologic maps

→

USGS state geologic maps

State-level GIS geologic datasets

→

FAQ

Are USGS geologic maps available as GIS-ready data?

Many USGS geologic maps are available as shapefiles or geodatabases. Coverage varies by state, with some states having comprehensive digital datasets and others primarily in GeoPDF format.

What is the NGMDB?

The National Geologic Map Database (NGMDB) is a USGS catalog of over 90,000 geologic maps and related earth science publications, serving as the primary discovery tool for US geologic map data.