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Geology of Saipan, Mariana Islands; Part 2, Petrology and soils
R. G. Schmidt, J. H. Johnson, R. J. McCracken
1957, Professional Paper 280-B-D
The rocks that comprise the volcanic formations of Saipan are of two principal types: dacites, which are characteristically glassy, and andesites, which are comparatively crystalline. The dacites consist primarily of silicic glass, oligoclase, and silica minerals (quartz, tridymite, cristobalite, chalcedony, and opal). Minor constituents in these rocks are green hornblende,...
Geology of Gabbs and vicinity, Nye County, Nevada
Charles J. Vitaliano, Eugene Callaghan, Norman J. Silberling
1957, Miscellaneous Field Studies Map 52
The geologic map of Gabbs and vicinity covers approximately 105 square miles of the northwestern part of the Paradise Peak quadrangle. The present report stresses the igneous, metamorphic, and structural geology. The map published at this time shows, (1) the distribution of igneous rocks in the area, (2) the relationship...
The deep channel and alluvial deposits of the Ohio Valley in Kentucky
Eugene H. Walker
1957, Water Supply Paper 1411
The alluvial deposits of Pleistocene age in the Ohio Valley form a ground-water reservoir of large storage capacity and yield. In this region it is the only source of large supplies of water that are both cool and of good quality the year round. The reservoir is heavily drawn upon,...