. Geology and water resources of a portion of Southeastern South Dakota . ter at all times. The lowerportions of Wolf Creek, Twelvemile Creek, and Lonetree Creek arerarely entirely dry, but above the last mile or two of their course thewater in the latter part of summer rarely flows upon the surface. UNDERGROUND WATERS. The most accessible underground waters are those flowing near thesurface of the ground or seeping through the upper portion of the tilltoward a water course, where there are shallow accumulations of sand,which form conduits for it. It flows slowty through the lower portionsof t
. Geology and water resources of a portion of Southeastern South Dakota . ter at all times. The lowerportions of Wolf Creek, Twelvemile Creek, and Lonetree Creek arerarely entirely dry, but above the last mile or two of their course thewater in the latter part of summer rarely flows upon the surface. UNDERGROUND WATERS. The most accessible underground waters are those flowing near thesurface of the ground or seeping through the upper portion of the tilltoward a water course, where there are shallow accumulations of sand,which form conduits for it. It flows slowty through the lower portionsof these sand accumulations and appears at intervals in waterholes alongthe upper portions of the more prominent streams. In these it rarelycomes forth in sufficient strength to attract attention. Where the slopeof the surface is toward an undrained basin, the water, flowing on yel-low till, contributes to the level of the water in an open lake until thewater level sinks below the surface, as it soon does in the great majority U. S. GEOLOGICAL SURVEY WATFR-SUPPLY PAPER A. DAKOTA SANDSTONE ON FIRESTEEL CREEK, IN TOWNSHIP 104 NORRANGE 61 WEST.
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