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Results for “Open File Map”
Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.
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Digital generalized geologic map of the Iron Hill, Colorado, alkaline rock complex
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Map showing location of observation wells in Rhode Island
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Topographic map of the Nankoweap-Kwagunt area, Grand Canyon, Arizona
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Map production using print-on-demand capabilities
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Interpretive geophysical fault map across the central block of Yucca Mountain, Nevada
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Geologic map of part of May Mountain Quadrangle, Lemhi County, Idaho
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Topographic map of Ophir and central Candor Chasmata of Mars
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Digital and preliminary bedrock geologic map of the Chittenden quadrangle, Vermont
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Digital and preliminary bedrock geologic map of the Chittenden quadrangle, Vermont
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Digital and preliminary bedrock geological map of the Rutland quadrangle, Vermont
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Geologic map of the East of Grotto Hills Quadrangle, California
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Indian Rocks Beach side-scan sonar mosaic map
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Maps showing mineralogical and geochemical data for heavy-mineral concentrates in the Tanacross quadrangle, Alaska
This series of maps showing the following data for heavy mineral concentrates: distribution and abundance of selected ore-related minerals, distribution and abundance of copper in the magnetic fraction, and distribution and abundance of lead, copper, tin, beryllium, tungsten and bismuth in the nonmagnetic fraction. The data are plotted on base maps showing generalized geology, base metal prospects in the Yukon-Tanana Upland, and the drainage pattern. The distribution and abundance of ore-related minerals (fig. A) were obtained by microscopic examination of the heavy-mineral concentrates. The number of mineral grains observed is shown in the map explanation. Figures B through H are geochemical maps showing the distribution and abundance of metals as determined by six-step semi-quantitative emission spectrography. The geochemical map symbols show sample sites and the actual values for the element in the sample as determined by spectrography. An explanation of sampling, preparation, and analytical procedure is given in Circular 734 which accompanies this folio. Complete analytical data for geochemical samples collected by the U.S. Geological Survey in the Tanacross quadrangle are available in an open-file report (O'Leary and others, 1976).