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Geology of the Three Forks quadrangle, Montana, with sections on petrography of igneous rocks
G. D. Robinson, Henry Frank Barnett
1963, Professional Paper 370
The Three Forks quadrangle at the head of the Missouri River, has a long stratigraphic succession. The oldest rocks are Precambrian gneiss, derived from arkosic sandstone, and amphibolite, probably altered from mafic sills and lava flows. The unmetamorphosed sedimentary rocks range in age from late Precambrian to Recent, have an...
Economic geology of the Central City district, Gilpin County, Colorado
P.K. Sims, Avery A. Drake Jr., E. W. Tooker
1963, Professional Paper 359
The Central City district, in Gilpin County, Colo., is on the east flank of the Front Range, about 30 miles west of Denver. The district is the most important mining camp in the Front Range mineral belt, and has yielded more than $100 million worth of gold, silver, uranium, and...
Effects of drought in the Rio Grande basin: Chapter D in Drought in the Southwest, 1942-56
H. E. Thomas
1963, Professional Paper 372-D
In headwater areas of the Rio Grande and its principal tributaries, variations in streamflow and in ground-water storage and discharge depend upon fluctuations in precipitation, with modifications by geologic factors and by the pattern of water development and use. In downstream areas the surfaceand ground-water resources are replenished not only...
Methods of collecting and interpreting ground-water data
1963, Water Supply Paper 1544-H
Because ground water is hidden from view, ancient man could only theorize as to its sources of replenishment and its behavior. His theories held sway until the latter part of the 17th century, which marked the first experimental work to determine the source and movement of ground water. Thus founded,...