{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Bryan Schaap", "hasEmail": "mailto:bdschaap@usgs.gov"}, "description": "This coverage contains information about the surficial geology for the area within the \nStanding Rock Indian Reservation, Sioux County, North Dakota, and Corson County, \nSouth Dakota. Identified units include: \n1) alluvium, terrace, outwash, colluvium, eolian \ndeposits, and buried-valley fill; \n2) glacial till; \n3) Fort Union Formation; \n4) Hell Creek \nFormation; \n5) Fox Hills Formation; and \n6) Pierre Shale. \nThe digital data were produced by the U.S. Geological Survey (USGS) in cooperation \nwith the U.S. Environmental Protection Agency.\n\t\t\nFigure 5 in Howells (1982) was scanned and digitized on-screen to create this coverage. \nSee cross reference information for more detail.\n\t\t\nAccording to the map credit for figure 5, the geology for Sioux County was based on \nsoil maps prepared by the U.S. Bureau of Indian Affairs (1959), data collected by \nRandich (1975), and a geologic map by Carlson (1978). The geology for Corson \nCounty was based on soil maps prepared by the U.S. Bureau of Indian Affairs (1959) \nand unpublished maps of the U.S. Soil Conservation Service, modified by test drilling \nand field reconnaissance.\n\t\t\nThe following definitions were used for figure 5.\n\t\t\nAlluvium, terrace, outwash, colluvium, eolian deposits, and buried-valley fill-- The small \nscale prevents differentiating these deposits on this map. Alluvium is water-laid material \ndeposited on flood plains and valleys of rivers and streams. Most of the material is clay, \nsilt, and fine sand but there is some coarser material. Terraces are older alluvial deposits \nthat now are above the level of the flood plain because the stream has eroded its valley \ndeeper since deposition of the sediment. \nOutwash was deposited in streams and lakes formed by melting glaciers. Maximum \nthickness of alluvium or outwash is less than 120 feet; of terraces, more than 50 feet. \nColluvium is landslide and slumpage detritus, commonly deposited at the foot of the \nsteep slopes. The material usually is fragments of shale, silt, and sand, but may \ninclude gravel or sandstone cobbles from terraces or sandstone beds capping higher \nbenches or buttes. Deposits may exceed 100 feet in thickness. Eolian deposits are \nwindblown material, mostly silt and fine sand, but include some clay and, in some \nareas, much medium sand. Deposits are as much as 20 feet thick, but a thin coating, \nas little as a fraction of an inch thick, overlies most of the area. Buried valley fill is \nmostly glacial stream and outwash deposits but includes some till. The material is \nmostly moderately-sorted gravel, sand, silt, and clay. Maximum thickness locally \nexceeds 300 feet. Quaternary Period.\n\t\t\nGlacial till -- Deposited beneath or at the margins of the continental glaciers. The \nmaterial is a heterogeneous mixture of sizes from clay to boulders. Maximum \nthickness probably is less than 40 feet. Quaternary Period.\n\t\t\nFort Union Formation -- Gray to buff interbedded very fine to medium-grained sandstone, \nsiltstone, claystone, silty clay, and shale; thin carbonaceous or lignitic beds near the \nbase. Contains three widely persistent sandstone beds. Maximum thickness is greater \nthan 400 feet. Tertiary Period.\n\t\t\nHell Creek Formation -- Somber-colored, soft clay shale and buff to gray, weakly-cemented, \ncoarse- to fine-grained sandstone and siltstone. Contains lignitic lenses and thin, black \ncarbonaceous shale beds. Maximum thickness may be greater than 400 feet. Cretaceous \nPeriod.\n\t\t\nFox Hills Formation -- Dark- to light-gray silty and sandy clay, clayey silt, and very fine-grained \nsandstone; overlain, in Corson County, by dark-gray to yellowish-orange, weakly-cemented, very \nfine-grained sandstone. The upper part of the formation is a thinly-bedded sequence of clay, silt, \nand sand, that contains discontinuous beds of silica-cemented very fine-grained sandstone. \nContacts between the Hell Creek and Pierre Shale are gradational. Maximum thickness is about \n400 feet. Cretaceous Period.\n\t\t\nPierre Shale -- Gray to brown, tough, gummy to friable shale, noncalcareous to highly calcareous, \ncontains widely persistent zones of bentonite and of iron manganese or limestone concretions. \nWhere exposed at the surface, the top few feet commonly is weathered. Maximum thickness is \nabout 1,400 feet. Cretaceous Period.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9DXWZ60", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.dcbb671f-b6eb-4c07-9df9-541824685dd3.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_dcbb671f-b6eb-4c07-9df9-541824685dd3", "keyword": ["Alluvium", "Corson County", "Cretaceous", "North Dakota", "Quaternary", "Sioux County", "South Dakota", "Standing Rock Indian Reservation, Sioux County, North Dakota, Corson County, South Dakota", "Tertiary", "USGS:dcbb671f-b6eb-4c07-9df9-541824685dd3", "buried-valley fill", "colluvium", "environment", "eolian deposits", "geology", "geoscientificInformation", "glacial till", "inlandWaters", "outwash", "terrace"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-102.051544, 45.441269, -100.313436, 46.430408", "theme": ["geospatial"], "title": "Surficial geology within the Standing Rock Indian Reservation, Sioux County, North Dakota, and Corson County, South Dakota"}