Rutile in Precambrian sillimanite-quartz gneiss and related rocks, east-central Front Range, Colorado
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Professional Paper↗
Geology topics
Sherman P. Marsh
Publications and source records attributed to Sherman P. Marsh.
Perspective diagrams showing geochemical abundance of silver, lanthanum, molybdenum, nickel, vanadium, yttrium, and zinc in the Nabesna Quadrangle, Alaska
The seven perspective diagrams on this sheet show the distribution patterns of silver, lanthanum, molybdenum, nickel, vanadium, yttrium, and zinc in stream sediments in the Nabesna quadrangle. The diagrams portray the distribution and abundance of the elements and their relation to some of the geologic units (Richter, 1975) in easy-to-visualize, 3-dimensional perspective.
Alaska↗
Geologic map of the Golconda quadrangle, Humboldt County, Nevada
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Geologic Quadrangle↗
Geologic map of the Iron Point quadrangle, Humboldt County, Nevada
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Geologic Quadrangle↗
Rutile and topaz in Precambrian gneiss, Jefferson and Clear Creek Counties, Colorado
Disseminated rutile and major amounts of topaz have been identified in Precambrian topaz-quartz gneiss northwest of Evergreen, Colo. The rutile occurs in quartz-topaz-sillimanite gneiss that forms a stratigraphic unit which is 11 to 100 feet thick and is identified along strike for more than 7,000 feet. Three composite chip samples taken across this unit contain 2.2 to 4.2 percent of rutile, by weight, in grains averaging from 0.1 to 0.3 millimeter in size. The topaz content, by weight, in the same samples ranges from 23 to 67 percent.
Circular↗