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A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
A concretion is a volume of sedimentary rock in which a mineral cement fills the porosity (i.e. the spaces between the sediment grains). The image shows a Sandstone Concretion in the wall at the beach of Año Nuevo State Reserve. This concretion was too high in the wall to place a ruler, but I estimate it to be about 400 mm long.
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Ausable Chasm is a sandstone gorge and tourist attraction located near the hamlet of Keeseville, New York, United States, [1] due west of Port Kent.The gorge is about two miles (3.2 km) long and is about 150 feet (46 m) deep.
sandstone Sand (with grains up to 2 mm in diameter) in which the grains are cemented together by secondary silica or calcite. Sandstone may be loosely cemented and soft or well cemented and hard, and is usually buff to brownish in color, sometimes reddish, due to the presence of iron oxides, or greenish, due to the presence of glauconite. sanidine
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The Great White Throne in Zion National Park is an example of white Navajo Sandstone Stevens Arch, near the mouth of Coyote Gulch in the Canyons of the Escalante, is formed from a layer of Navajo Sandstone. The opening is 220 feet (67 m) wide and 160 feet (49 m) high.
The Oriskany Sandstone is a Middle Devonian age unit of sedimentary rock found in eastern North America. The type locality of the unit is located at Oriskany Falls in New York. [1] The Oriskany Sandstone extends throughout much of the Appalachian Basin. [2] [3] [4] The unit name usage by the U.S. Geological Survey (USGS) is the Oriskany ...