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Geology and pegmatites of part of the Fourmile area, Custer County, South Dakota
Andrew J. Lang, Jack Allison Redden
1953, Circular 245
The Fourmile area, Custer County, S. Dak., is underlain by pre-Cambrian metamorphic rocks that surround the granitic core of the Black Hills. The main structure in the area is the upright limb of an overturned anticline that plunges about 30 ? S. 10 ? E. Three units of metamorphic rocks...
Sedimentation in small reservoirs on the San Rafael Swell, Utah
Norman Julius King, Mervyn M. Mace
1953, Circular 256
Movement of sediment from upland areas and eventually into main drainages and rivers is by no means through continuous transportation of material from the source to the delta. Instead it consists of a series of intermittent erosional and depositional phases that present a pulsating movement. Hence, sediment carried off upland...