EarthWorks Geospatial Catalog

Quaternary geologic map of the Helena Valley, Montana [cartographic material] / by Michael C. Stickney ; prepared in cooperation with the U.S. Geological Survey.

Relief shown by contours and spot heights. "Geology mapped 1980-81; 1985-86." Includes index map and ancillary map of fault distribution.
Montana Bureau of Mines and Geology
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