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USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps.

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January 1, 1979

Geologic map of the Fire Rock Well Quadrangle, San Juan County, New Mexico Geologic map of the Fire Rock Well Quadrangle, San Juan County, New Mexico

No abstract available.

January 1, 1979

Geologic map of the greater Denver area, Front Range urban corridor, Colorado Geologic map of the greater Denver area, Front Range urban corridor, Colorado

This digital map shows the areal extent of surficial deposits and rock stratigraphic units (formations) as compiled by Trimble and Machette from 1973 to 1977 and published in 1979 under the Front Range Urban Corridor Geology Program. Trimble and Machette compiled their geologic map from published geologic maps and unpublished geologic mapping having varied map unit schemes. A convenient...

January 1, 1979