Matches in DBpedia 2015-10 for { ?s ?p "The Jordan Formation (also classified as the Jordan Sandstone or the Jordan Member of the Trempealeau Formation) is a siliciclastic sedimentary rock unit identified in Illinois, Michigan, Wisconsin, Minnesota, and Iowa. Named for distinctive outcrops in the Minnesota River Valley near the town of Jordan it extends throughout the Iowa Shelf and eastward over the Wisconsin Arch and Lincoln anticline into the Michigan Basin.Stratigraphically, the Jordan Formation is the uppermost unit of the type St. Croixan Series (historically, the uppermost subdivision of the Cambrian in North America). It is predominantly composed of mature, poorly cemented quartz sandstone, though several distinct facies have been identified on the basis of grain size, feldspathic content, and sedimentary structures.The Jordan is an important source of silica. Historically, the unit has been mined extensively for glass manufacturing, though recently it has been utilized as a source of frac sand. This porous, poorly cemented stratum is also an important aquifer and a major source of drinking water for people throughout the upper Midwest."@en }
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- Jordan_Formation abstract "The Jordan Formation (also classified as the Jordan Sandstone or the Jordan Member of the Trempealeau Formation) is a siliciclastic sedimentary rock unit identified in Illinois, Michigan, Wisconsin, Minnesota, and Iowa. Named for distinctive outcrops in the Minnesota River Valley near the town of Jordan it extends throughout the Iowa Shelf and eastward over the Wisconsin Arch and Lincoln anticline into the Michigan Basin.Stratigraphically, the Jordan Formation is the uppermost unit of the type St. Croixan Series (historically, the uppermost subdivision of the Cambrian in North America). It is predominantly composed of mature, poorly cemented quartz sandstone, though several distinct facies have been identified on the basis of grain size, feldspathic content, and sedimentary structures.The Jordan is an important source of silica. Historically, the unit has been mined extensively for glass manufacturing, though recently it has been utilized as a source of frac sand. This porous, poorly cemented stratum is also an important aquifer and a major source of drinking water for people throughout the upper Midwest.".