| Reference | {Deposit:: CLARKE, O.M. JR. AND TYRRELL, M.E., 1976, PORTERS CREEK LIGHTWEIGHT AGGREGATE: ALABAMA GEOLOGICAL SURVEY CIR. 100, 35 P}{Deposit:: CLARKE, O.M. JR., 1970, CLAYS OF SOUTHWEST ALABAMA: ALABAMA GEOLOGICAL SURVEY CIR. 20-E, 97 P.}{Deposit:: CLARKE, O.M. JR. AND OTHERS, 1973, MINERAL RESOURCES OF MARENGO COUNTY, ALABAMA: ALABAMA GEOLOGICAL SURVEY CIR 91, 38 P.}{Deposit:: CLARKE, O.M. JR., 1973, LIGHTWEIGHT AGGREGATE RESOURCES OF MARENGO COUNTY: ALABAMA GEOLOGICAL SURVEY OPEN FILE, 31 P.} |