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Geology of the Cerro Gordo mining district, Inyo County, California
Charles Warren Merriam
1963, Professional Paper 408
The Inyo Mountains near Cerro Gordo comprise strongly folded and faulted sedimentary rocks ranging in age from Ordovician to Middle Triassic. These were intruded by granitic bodies, aplite dikes, and by innumerable andesitic and dacitic dikes of later age. Though largely nonfoliated, the sedimentary rocks have undergone varying degrees of...
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...