Map Showing Distribution of Underground Water in the Dakota and Underlying Sandstones in the Northern Half of the Black Hills Region in South Dakota and Wyoming

This beautifully colored geological map for the United States Geological Survey, done by N.H Darton was published in 1908. This map shows the underground water in the Dakotas and underlying sandstones in the northern half of the Black Hills region. The colored portions indicate the outcrop area of Dakota and associated sandstones, Minnelusa sandstone, Deadwood formation, and depths. Topographic features that show land contours and heights are also shown.

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