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Yosemite National Park, California. Schlieren - streaks or layers formed by the clustering of dark minerals during differential flow within the partially solidified magma. Note the parallel alignment of potassium feldspar phenocrysts by the same process. Larger phenocrysts are about 2 inches long. Figure 16, U.S. Geological Survey Bulletin 1595.
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Down the canyon of Middle Fork of Popo Agie River, near Lander; showing walls composed of hard layers of limestone and sandstone ranging in age from Cambrian to Permian. The prominent ledge at the skyline is composed of sandstone and limestone of Pennsylvania age. Photos lwt228a, lwt2288b and lwt2288c form this panorama. Fremont County, Wyoming. 1922. Plate 5-A in U.S. Geological Survey. Professional paper 149. 1927.
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Gypsum (selenite) within display case. Mineral collection of Brigham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. No BYU index. This image is in the public domain pursuant to an agreement dated August 10, 2006 between Peter J. Modreski, USGS Communications and Outreach, and the Brigham Young University (BYU) Geology Department. Please credit the Brigham Young University Geology Department and the individual photographer.
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Ptygmatic folding of light dioritic seams in dark finer grained facies of Cardigan gneiss. Note that the ptygmatic veins transect the older foliation, marked by thin layers of dark and light minerals. Pima County, Arizona. 1932. Plate 4-E, in U.S.Geological Survey Professional paper 209. 1946.
Categories: Image; Tags: Lay Mine, photo print
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Soft gypseous crust underlain by a 10 to 20 inch layer of high-purity ulexite that was mined in shallow pits now filled with water, Salar de Ascotan. The pond is about 10 feet wide. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 29. 1974.
Categories: Image; Tags: Lay Mine, photo print
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Manganite and psilomelane: Polished surface of concentrically banded dense psilomelane and associated crystalline manganite; soft structureless cores of pyrolusite or wad are surrounded by banded psilomelane, the inner layers of which are highly crinkled and in cavities and crevises of which there is crystalline manganite, from Cook mine, X 3, near Walnut Grove, Etowah County, Alabama. 1918. Plate 7-B in U.S. Geological Survey Bulletin 737. 1923.
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Views of oyster reefs and sandstone of the Lewisville member of the Woodbine formation: Prominent mass of tuffaceous sandstone underlain by dark gray shaly clay and gray calcareous sand (locality 179) of the Lewisville member, at the downstream end of Hyatts Bluff, Red River 4.5 miles northwest of Ravenna. Fannin County, Texas. Plate 6-D, in U.S.Geological Survey Professional Paper 242. 1952.
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Diaspore (Burly Clay). Close view. Pen for scale. Collected from Near Swiss, Missouri. Mineral collection of Brigham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 4-2015, AlO(OH). This image is in the public domain pursuant to an agreement dated August 10, 2006 between Peter J. Modreski, USGS Communications and Outreach, and the Brigham Young University (BYU) Geology Department. Please credit the Brigham Young University Geology Department and the individual photographer.
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Diaspore (Burly Clay). Pen for scale. Collected from Owensville, Missouri. Mineral collection of Brigham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 4- 2014, AlO(OH). This image is in the public domain pursuant to an agreement dated August 10, 2006 between Peter J. Modreski, USGS Communications and Outreach, and the Brigham Young University (BYU) Geology Department. Please credit the Brigham Young University Geology Department and the individual photographer.
Categories: Image; Tags: Lay Mine, photo print
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Unconformity between cross-bedded crystalline sandy limestone of the "Tellico" and underlying Holston marble in the pits of D.A.M. mine, sandy layers in the "Tellico" brought out in relief by weathering, and thin bed of psilomelane in marble just below the unconformity. Bradley County, Tennessee. 1918. Plate 13-A in U.S. Geological Survey Bulletin 737. 1923.
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Down the canyon of Middle Fork of Popo Agie River, near Lander; showing walls composed of hard layers of limestone and sandstone ranging in age from Cambrian to Permian. The prominent ledge at the skyline is composed of sandstone and limestone of Pennsylvania age. Photos lwt228a, lwt2288b and lwt2288c form this panorama. Fremont County, Wyoming. 1922. Plate 5-A in U.S. Geological Survey. Professional paper 149. 1927.
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Sculptured cliffs along coast line near Santa Barbara, the cliffs consist of gravel, sand, and clay that cap the prominent marine terrace traversed by the railroad. Santa Barbara County, California. 1914. Plate 27 in U.S. Geological Survey. Bulletin 614. 1916.
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Typical exposure of Mauch Chunk shale at the viaduct between South Fork and Mineral Point; note the alternating thin layers of sandstone and shale and the vertical jointing. Cambria County, Pennsylvania. 1906. Plate 5-A in U.S. Geological Survey. Bulletin 447. 1911.
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Variscite. Collected from Clay Canyon, Fairfield, Utah. Mineral collection of Brigham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 9-3001, AlPO_4 x 2(H_2O). This image is in the public domain pursuant to an agreement dated August 10, 2006 between Peter J. Modreski, USGS Communications and Outreach, and the Brigham Young University (BYU) Geology Department. Please credit the Brigham Young University Geology Department and the individual photographer.
    map background search result map search result map Opening into the Lay Mine at Lay, Moffat County, Colorado. 1912. Views of oyster reefs and sandstone of the Lewisville member of the Woodbine formation. Fannin County, Texas. No date. Manganite and psilomelane from Cook mine X 3 near Walnut Grove, Etowah County, Alabama. 1918. Manganite and psilomelane from Cook mine X 3 near Walnut Grove, Etowah County, Alabama. 1918. Views of oyster reefs and sandstone of the Lewisville member of the Woodbine formation. Fannin County, Texas. No date. Opening into the Lay Mine at Lay, Moffat County, Colorado. 1912.