T.M. Gathright, Jr.; P.G. Nystrom, Jr., 6 x 9-inch soft cover book, 55 pages, one plate includes folded 24 x 33-inch color geologic map, 22 figures, four tables, 1974. This report and the accompanying map portray and describe the stratigraphy, structure, metamorphism and economic geology of the Ashby Gap 7.5-minute quadrangle (portions of Clarke, Loudoun, and Fauquier counties) with cross-sections. Blue Ridge cover rocks, Valley and Ridge sedimentary rocks and recent alluvium are mapped in the area. Limestone, dolostone, iron, copper, lead, and barite resources are discussed in the text. Two measured sections are included.
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