GMNA Resources

A collection of geospatial files, map images, publication documentation, and informational resources in support of the Geologic Map of North America.


Map Images

Downloadable high-resolution georeferenced images of the The Geologic Society of America's printed GMNA map for viewing or using in a GIS (includes geologic unit explanation sheets).

Learn more about GSA

GMNA North – ZIP (50 MB) | JPEG (27 MB)

GMNA Legend – PDF (32 MB) | JPEG (5 MB)

GMNA South – ZIP (50 MB) | JPEG (27 MB)


Information about how the map and database were prepared, the history of the source map, database contents, and the sources used to compile them.

Learn more about the source map

Map Manuscript – PDF (1 MB)  

Map References – PDF (1 MB)  

Database Design – PDF (1 MB)

Geospatial Files

The GMNA was converted to a GIS database and published as USGS DS-424 in 2009. A variety of GIS-ready products are available for download.

Learn more about USGS DS-424

Shapefiles – ZIP (120 MB)   

Metadata – XML (320 KB)   

Geodatabase – ZIP (72 MB)

Google Earth – North (56 MB) | South (56 MB)


The NGMDB provides standardized, spatial geoscience information for the Nation.

Learn more

Contact Us

Questions or comments about the GMNA or map database? Contact the authors here.

Contact Us