Richmond, VA: University of Richmond, 1945. First edition. Original Wraps. Small quarto, pp. 152, indexed, illustrated with b/w photographs and drawings, including several fold-out reference illustrations. Library stamp on the front cover. Very good; mild ex-library. Item #19582
The commercial granites and certain other crystalline rocks discussed in this report crop out in parts of the Piedmont and Blue Ridge provinces. They are classified, on the basis of physical characteristics, into six groups: (1) massive, quartz-bearing intrusive rocks, including granite, quartz monzonite, granodiorite, and quartz diorite; (2) gneissic and schistose granite, granodiorite, and quartz diorite; (3) greenstone of extrusive origin, now more or less foliated; (4) basic, dark-colored intrusive rocks which are foliated; (5) massive intrusive diabase (Trassic); and (6) unakite in more or less dikelike bodies. The location and extent of many of these bodies of rocks are shown on a geologic map of Virginia, published in 1928.