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.
Related
Where can I find information about the geology and natural history of National Parks?
Are there geologic maps or publications for where I live?
How can I find original field notes made by USGS geologists and geographers?
What is marine geology?
Where can I get data from core samples, or access the actual cores?
What is Earth MRI?

Geologic map overlaid on topography for the Mountain Pass region in California.
Geologic map overlaid on topography for the Mountain Pass region in California.
PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!
linkThe National Geologic Map Database
A wealth of geologic information at your fingertips!
By David Soller, USGS Geologist
PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!
linkThe National Geologic Map Database
A wealth of geologic information at your fingertips!
By David Soller, USGS Geologist
Depiction of a national geologic map of the U.S. used as an illustration for EDMAP and STATEMAP outreach
Depiction of a national geologic map of the U.S. used as an illustration for EDMAP and STATEMAP outreach
The geologic time scale showing each eon, era, period, epoch, and their associated ages.
The geologic time scale showing each eon, era, period, epoch, and their associated ages.

Simplified Geologic Map of Yellowstone, modified from USGS I-711 by Marli Miller, University of Oregon. All rock material resulting from the major caldera-forming eruptions are labelled at Qt, where the dashed caldera boundary highlights the scale of these events. Older volcanic, sedimentary and metamorphic rocks are found outside of this boundary.
Simplified Geologic Map of Yellowstone, modified from USGS I-711 by Marli Miller, University of Oregon. All rock material resulting from the major caldera-forming eruptions are labelled at Qt, where the dashed caldera boundary highlights the scale of these events. Older volcanic, sedimentary and metamorphic rocks are found outside of this boundary.

Geologic Map of the Southern Flank of Mauna Loa Volcano, Island of Hawai‘i
Geologic Map of the Southern Flank of Mauna Loa Volcano, Island of Hawai‘i
Divisions of geologic time—Major chronostratigraphic and geochronologic units
Divisions of geologic time (Bookmark)
Database of the geologic map of North America— Adapted from the map by J.C. Reed, Jr. and others (2005)
About the geologic map in the National Atlas of the United States of America
Geology of the conterminous United States at 1:2,500,000 scale a digital representation of the 1974 P.B. King and H.M. Beikman map
Digital files of geologic map symbols with cartographic specifications
The logic of geological maps, with reference to their interpretation and use for engineering purposes
Related
Where can I find information about the geology and natural history of National Parks?
Are there geologic maps or publications for where I live?
How can I find original field notes made by USGS geologists and geographers?
What is marine geology?
Where can I get data from core samples, or access the actual cores?
What is Earth MRI?

Geologic map overlaid on topography for the Mountain Pass region in California.
Geologic map overlaid on topography for the Mountain Pass region in California.
PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!
linkThe National Geologic Map Database
A wealth of geologic information at your fingertips!
By David Soller, USGS Geologist
PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!
linkThe National Geologic Map Database
A wealth of geologic information at your fingertips!
By David Soller, USGS Geologist
Depiction of a national geologic map of the U.S. used as an illustration for EDMAP and STATEMAP outreach
Depiction of a national geologic map of the U.S. used as an illustration for EDMAP and STATEMAP outreach
The geologic time scale showing each eon, era, period, epoch, and their associated ages.
The geologic time scale showing each eon, era, period, epoch, and their associated ages.

Simplified Geologic Map of Yellowstone, modified from USGS I-711 by Marli Miller, University of Oregon. All rock material resulting from the major caldera-forming eruptions are labelled at Qt, where the dashed caldera boundary highlights the scale of these events. Older volcanic, sedimentary and metamorphic rocks are found outside of this boundary.
Simplified Geologic Map of Yellowstone, modified from USGS I-711 by Marli Miller, University of Oregon. All rock material resulting from the major caldera-forming eruptions are labelled at Qt, where the dashed caldera boundary highlights the scale of these events. Older volcanic, sedimentary and metamorphic rocks are found outside of this boundary.

Geologic Map of the Southern Flank of Mauna Loa Volcano, Island of Hawai‘i
Geologic Map of the Southern Flank of Mauna Loa Volcano, Island of Hawai‘i