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Cook Inlet has been recognized as the second-largest petroleum province in Alaska, second only to the North Slope. The south-central Tyonek Quadrangle is an area of significant geologic interest because it is the only location in Cook Inlet where the entire producing stratigraphy of the basin is exposed on the surface. Additionally, this area encompasses the structural boundary between the forearc basin and its sediment source rocks. To better understand the petroleum system and the geologic relationships between the exhumed arc intrusive rocks and adjacent Cenozoic stratigraphy of the Cook Inlet forearc basin, during the summer of 2010 the Alaska Division of Geological & Geophysical Surveys conducted a federally-funded...
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Mineral Resources Section personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a geologic field survey, including mapping and sampling, in the eastern part of the Bonnifield mining district in the Fairbanks A-1 and A-2 and the Healy D-1 and D-2 quadrangles, Alaska, from June 16 through July 18, 2008. The fieldwork provides basic information critical to building an understanding of Alaska's geology and is part of an integrated program of airborne geophysical surveys followed by geologic mapping. Specifically, this work provides geologic context for geophysical surveys conducted in 2006. Interpretation and synthesis of this data has been presented in professional and trade meetings....
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Photomicrograph of vein rock shown in photo 37, with plain light, showing orthoclase, or, fractured and veined by quartz q. Bartow County, Georgia. Circa 1944. Plate 12-C, in U.S.Geological Survey Professional paper 224. 1950.
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Yosemite National Park, California. Glaciated rock between Mono Pass and Parker Pass. The direction of ice motion was from the foreground on the right toward the distance on the left. An angular cavity, due to the plucking of a block separated by joint planes, was modified by subsequent abrasion. The hill beyond is a spur of Mount Gibbs. 1903.
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Yosemite National Park, California. Glaciated rocks between Mono Pass and Parker Pass in the Sierra Nevada. The direction of ice motion was from right to left. A joint face on the lee side, exposed by the plucking away of a block, remains unscored. 1903.
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East Butte, Sweetgrass Hills, looking south from top of Black Butte. These hills are of intrusive igneous rock rising to about 6200 feet A.T., and were not glaciated. Toole County, Montana. August 11, 1920.
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Panorama with image 9b. Retake of Dutton 22, Pyramid Rock (ratio 1:3.6) east of Gallup New Mexico. Apparently camera was a few feet closer to rock face on the left than Dutton's. Some blue grama; big bush in foreground Atriplex con, 10 percent galleta, thistle growing base of Atriplex con. McKinley County, New Mexico. August 16, 1946.
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Sequoia National Park, California. Southeast from the base of Moro Rock. Castle Rocks on the right. Great Western Divide on the left. Turtle Rock in the foreground. Photo by L. Eddy, 1925.
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Swift Creek Canyon east of Afton, Wyoming. Dip slope of carboniferous rocks on south side of canyon. Looking east from north wall at about the left of edge of image 039. Wyoming. September 28, 1914.
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Yosemite National Park, California. Yosemite Falls and surrounding cliffs, viewed from the valley floor. Only the head of Lower Yosemite Fall is visible through the trees. Dark zones of vegetation crossing the cliffs on the left reveal narrow terraces developed along zones of sheared rock. Sparseness of vegetation in the intermediate spaces is indicative of the absence of joints in the rock. Circa 1913.


map background search result map search result map Glacier Bay National Park and Preserve, Alaska. Glaciated rocks at Reid Inlet. Harriman Expedition, 1899. Preliminary bedrock geologic map data for the eastern Bonnifield mining district, Fairbanks and Healy quadrangles, Alaska Major-oxide and trace-element geochemical data from rocks collected in 2010 in the Tyonek Quadrangle, Alaska Glacier Bay National Park and Preserve, Alaska. Glaciated rocks at Reid Inlet. Harriman Expedition, 1899. Preliminary bedrock geologic map data for the eastern Bonnifield mining district, Fairbanks and Healy quadrangles, Alaska Major-oxide and trace-element geochemical data from rocks collected in 2010 in the Tyonek Quadrangle, Alaska