Virginia DMME Geology and Mineral Resources Map: An interactive geology map of Virginia from the Department of Mines, Minerals, and Energy.
Geology and Mineral Resources of the Roanoke Area, Virginia: A PDF version of the 1932 Virginia Geological Society Bulletin #34 by Herbert P. Woodward. It is a “…comprehensive discussion of the surface features, rock formations, structure, geologic history, and mineral resources of Roanoke County and adjoining parts of Botetourt, Bedford, Franklin, Floyd, Montgomery, and Craig counties.”
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