Pahasapa Formation
http://dbpedia.org/resource/Pahasapa_Formation
The Pahasapa Formation is a geological unit of primarily limestone and dolomite that is exposed in the Black Hills of South Dakota and northwestern Wyoming, and underlies parts of Nebraska, in the United States. Also referred to as the Pahasapa Limestone (especially in older publications and outside South Dakota), this unit is analogous to the Madison Limestone,the Lodgepole Limestone,and the Burlington Limestone, other Mississippian-aged limestones and dolomites in the midwestern United States. Some recent literature has grouped stretches of the Pahasapa into the Madison Group. The formation is of local importance, as it contains the Madison aquifer, and two of the ten longest caves in the world.
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Pahasapa Formation
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Pahasapa Formation
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43248117
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1120488238
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Mississippian
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A hundred foot cliff of white limestone that shades to grey at the top rises above a small creek. Small pines and swallow nests line the nock of the eroding cliff face. The top of the cliff boasts tall pines and grasses.
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An exposure of the cliff forming Pahasapa west of Rapid City, along Nemo Road. The karstic tendencies of the unit are clearly visible in the pitting of the face.
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South Dakota, Wyoming, Nebraska
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225
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The Pahasapa Formation is a geological unit of primarily limestone and dolomite that is exposed in the Black Hills of South Dakota and northwestern Wyoming, and underlies parts of Nebraska, in the United States. Also referred to as the Pahasapa Limestone (especially in older publications and outside South Dakota), this unit is analogous to the Madison Limestone,the Lodgepole Limestone,and the Burlington Limestone, other Mississippian-aged limestones and dolomites in the midwestern United States. Some recent literature has grouped stretches of the Pahasapa into the Madison Group. The formation is of local importance, as it contains the Madison aquifer, and two of the ten longest caves in the world.
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Darton, in 1901
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the Dakota people's name for the Black Hills
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Dolomite, dolomitic limestone
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Englewood Formation
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10110
