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 Content
How do I find, download, or order topographic maps?
Are there geologic maps or publications for where I live?
Where can I find information about the geology and natural history of National Parks?
Divisions of geologic time (Bookmark)
DescriptionThis bookmark presents information that is widely sought by educators and students. This bookmark is adapted from the more detailed U.S. Geological Survey Fact Sheet 2018–3054, “Divisions of Geologic Time,” prepared by the U.S. Geological Survey Geologic Names Committee in cooperation with the Association of American State Geologists....
Divisions of geologic time—Major chronostratigraphic and geochronologic units
IntroductionEffective communication in the geosciences requires a consistent nomenclature for stratigraphic units and, especially, for divisions of geologic time. A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years.Geologists from the U.S. Geological Survey (USGS), State...
Geologic map of Alaska
Summary This map and associated digital databases are the result of compilation and interpretation of published and unpublished 1:250,000-scale and limited 1:500,000- to 1:63,360-scale maps. Covering the entire state of Alaska, it reflects more than a century of work by a host of geologists and almost two decades of compilation work. There are two...
Wilson, Frederic H.; Hults, Chad P.; Mull, Charles G.; Karl, Susan M.
Database of the Geologic Map of North America: Adapted from the map by J.C. Reed, Jr. and others (2005)
IntroductionThe Geological Society of America's (GSA) Geologic Map of North America (Reed and others, 2005a; 1:5,000,000) shows the geology of a significantly large area of the Earth, centered on North and Central America and including the submarine geology of parts of the Atlantic and Pacific Oceans. This map is now converted to a Geographic...
Garrity, Christopher P.; Soller, David R. About the geologic map in the National Atlas of the United States of America
Introduction The geologic map in the National Atlas of the United States of America shows the age, distribution, and general character of the rocks that underlie the Nation, including Alaska, Hawaii, Puerto Rico, and the Virgin Islands (but excluding other small island possessions). (The National Atlas of the United States can be accessed at URL...
Reed, John C.; Bush, Charles A. The North America tapestry of time and terrain
The North America Tapestry of Time and Terrain (1:8,000,000 scale) is a product of the US Geological Survey in the I-map series (I-2781). This map was prepared in collaboration with the Geological Survey of Canada and the Mexican Consejo Recursos de Minerales. This cartographic Tapestry is woven from a geologic map and a shaded relief image....
Barton, Kate E.; Howell, David G.; Vigil, Jose F. A tapestry of time and terrain
Vigil, J.F.; Pike, R.J.; Howell, D.G. 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
This CD-ROM contains a digital version of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. In addition to the graphical formats, the map key is included in ASCII text. A geographic information system (GIS) allows combining and overlaying of layers for...
Schruben, Paul G.; Arndt, Raymond E.; Bawiec, Walter J. Digital files of geologic map symbols with cartographic specifications
Collecting rocks
Barker, Rachel M.
The logic of geological maps, with reference to their interpretation and use for engineering purposes
Varnes, David J.
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.
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, 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.
Divisions of Geologic Time 2018
Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2018.
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.
The
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Geologic map
Geologic map
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.
Massachusetts geologic map
Massachusetts geologic map, obtained from: https://ngmdb.usgs.gov/Prodesc/proddesc_16357.htm
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.