Reference | {Deposit:: ESPENSHADE, G.H., 1954, GEOLOGY AND MINERAL RESOURCES OF THE JAMES RIVER-ROANOKE RIVER MANGANESE DISTRICT, VIRGINIA U.S. GEOLOGICAL SURVEY BULL. 1008, 155P.}{Deposit:: CONLEY, J.F., 1985, GEOLOGY OF THE SOUTHWESTERN PIEDMONT VIRGINIA DIVISION OF MINERAL RESOURCES PUBLICATION 59, 33P. (GENERAL GEOLOGY).} |