What is the National Geologic Map Database?

The National Geologic Map Database (NGMDB) is an archive of geoscience maps (including geology maps), reports, and stratigraphic information for the United States. The NGMDB contains information on more than 90,000 maps and related geoscience reports published from the early 1800s to the present day, by more than 630 agencies, universities, associations, and private companies. Much of the content can be viewed and downloaded through NGMDB.

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How do I find, download, or order topographic maps?

The U.S. Geological Survey (USGS) has been the primary civilian mapping agency of the United States since 1879. The best known USGS maps are the 1:24,000-scale topographic maps, also known as 7.5-minute quadrangles. Download all dates and scales of USGS topographic maps free of charge from the following applications or order paper copies of all...

Are there geologic maps or publications for where I live?

Detailed geologic mapping has not been completed for the entire United States, but maps are available for most locations. Geologic maps at many scales and from many sources are listed in the National Geologic Map Database . Some geologic maps can be purchased in hard copy through the USGS Store . Download digital geologic maps for entire states...

Where can I find information about the geology and natural history of National Parks?

Our National Parks are the showcases of our nation's geological heritage. The National Park Service has websites for most individual parks that include information about their geology and natural history. A source of information from the USGS is our Geology and Ecology of National Parks website. The website has listings for regions of the country...
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Date published: August 21, 2017

Stitching Together the New Digital Geologic Quilt of the United States

A carbonatite here, a glacial moraine there, a zig-zagging fault or two, even a behemoth of a batholith. The geology of the 50 States is an enormous patchwork of varied forms, beautiful in their variance but challenging to present as a single map.

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Geologic Map
August 6, 2019

Geologic map of a transect across the central California Coastal Range

Map showing the geologic complexity of the central California Coast Ranges from the offshore San Gregorio0-Hosgri fault inland to the San Andreas fault. 

Geologic map of the confluence of the Green and Yampa rivers, Dinosaur National Monument, Colorado/Utah
December 31, 2018

Geologic map, Dinosaur National Monument

Detail from geologic map of the confluence of the Green and Yampa rivers showing Mitten Park fault in Dinosaur National Monument, Colorado/Utah.

The current chart from Divisions of Geologic Time, 2018
July 20, 2010

Divisions of Geologic Time 2018

Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2018.

Crop from Tapestry of Time and Terrain
July 13, 2005

Crop from Tapestry of Time and Terrain

Crop from Tapestry of Time and Terrain

Image: Geologic Map of North America
February 1, 2005

Geologic Map of North America

This map was produced from Geographic Information System (GIS) files prepared by the USGS National Geologic Map Database (NGMDB).  The GMNA Resources Site has the geospatial files, map images, publication documentation, and informational resources.


Three Dimensional Geologic Map of North and Middle Sisters, Oregon...

Three Dimensional Geologic Map of North and Middle Sisters, OR

Overlay of a portion of the geologic map of the Bend 30- x 60-minute quadrangle, central Oregon (Geologic Investigations Series Map I-2683), as created in the National Geologic Map Database.

Geologic Map for Puerto Rico

Geologic Map for Puerto Rico

Geologic units and faults from USGS Open File Report 98-38, concerning assessment of the mineral resources of Puerto Rico.