| Reference | {Deposit:: F1 < ANDERSON, W. I., AND GARVIN, P. L., 1984, THE CEDAR VALLEY FORMATION (DEVONIAN), BLACK HAWK AND BUCHANAN COUNTIES: CARBONATE FACIES AND MINERALIZATION: GEOLOGICAL SOCIETY OF IOWA GUIDEBOOK 42, 47 P.}{Deposit:: F2 < BROWN, C. E., 1967, FLUORITE IN CRYSTAL-LINED VUGS IN THE MAQUOKETA SHALE AT VOLGA, CLAYTON COUNTY, IOWA: AMERICAN MINERALOGIST, V. 52, P. 1735-1750.} |