1961. 2018-05-14T19:43:37Z. 2018-05-14T19:43:37Z. Steece, Fred V. South Dakota Geological Survey. English. cartographic image. Public. South Dakota and South Dakota. Precambrian and From 570 million to 5 billion years ago.
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1994. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. South Dakota. Precambrian.