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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, 1972

Map showing relative ease of excavation in the Aspen Quadrangle, Pitkin County, Colorado Map showing relative ease of excavation in the Aspen Quadrangle, Pitkin County, Colorado

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January 1, 1972

Map showing relative ease of excavation in the Salina quadrangle, Utah Map showing relative ease of excavation in the Salina quadrangle, Utah

This map shows the relative ease (or difficulty) with which rocks and surficial deposits can be excavated. Because of rapidly changing technology of excavation and considerable local variability of many rock units, it is not practical to specifically categorize rock units according to type of equipment needed for their excavations. However, it may be stated in general that rock units...

January 1, 1972