{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Erick Burns", "hasEmail": "mailto:eburns@usgs.gov"}, "description": "This shapefile was created as a boundary for the Columbia River Basalt extent and a buffered version \nwas used to clip the geomodel unit grids.  As part of a U.S. Geological Survey Groundwater Resources \nProgram study, a three-dimensional geomodel was constructed for approximately 53,000 mi2 of the \nColumbia Plateau in Washington, Oregon, and Idaho. This geomodel was constructed to define the \ngeneral aquifer system geometry for use in a regional numerical groundwater flow model. Simplifications \nand assumptions consistent with this ultimate goal and the uncertainty in the available data were made. \nThe geomodel units consist of Miocene age Columbia River Basalt Group strata and younger alluvial \noverburden covering approximately 44,000 mi2. Data were compiled from numerous databases and \ndetailed studies completed during the past three decades. These data include stratigraphic interpretations \nmade on more than 13,000 wells and a contiguous compilation of surficial geology and structural features \nspanning the study area. These data were simplified and used to construct piecewise-smooth trend \nsurfaces that represent upper and lower subsurface geomodel unit boundaries in this complex folded \nand faulted terrain.  The smoothness of the surfaces implicitly represents uncertainty in prediction of \neach surface resulting from data gaps, errors in borehole interpretations, errors in mapped contact \nlocations, and uncertainty in the shape of the paleo-surface upon which flood basalts were emplaced. \nUsing a rule-based algorithm, surfaces were then recombined to construct a fully three-dimensional \nmodel with a 500-foot grid resolution that is consistent with the data and for which error estimates \nmay be made. The modeling process yielded improved estimates of unit volumes, refinement of location \nof large structural features, and identification of features that may be important for ongoing groundwater \nstudies.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9T65QM8", "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.b88ae309-ee02-4611-9c9b-48ce6ee7d2aa.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_b88ae309-ee02-4611-9c9b-48ce6ee7d2aa", "keyword": ["CPRAS", "Columbia Plateau", "Columbia Plateau Regional Aquifer System", "Columbia River Basalt extent", "Columbia River Basin", "Idaho", "Oregon", "Pacific Northwest", "USGS:b88ae309-ee02-4611-9c9b-48ce6ee7d2aa", "Washington", "geomodel", "inlandWaters"], "modified": "2020-11-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-121.719695672, 44.348072353, -115.498138599, 48.337350778", "theme": ["geospatial"], "title": "Modeled Combined Extent of All Columbia River Basalt Units (CRB_extent4xconnections)"}