Water Supply and Irrigation Papers of the United States Geological Survey . 90 m;T chin sew co. R-57 w | W I + 210 (etc.)Representative wells and their depth in feetwhich obtain pump water at base of till MAP OF A PORTION OF Ej Showing depths to w; BY S(! L ...... J L 1 0 0 -50 50 -100 100 - 150 WATER-SUPPLY PAPER N° 34 •?::,+! J60; A f*5o 40-4 ? 9o\ ERX SOUTH DAKOTAit base of* the till 99 IU5 BIEN 8 CO. LITH 250-300 TODD0 GENERAL GEOLOGY. 17 PIERRE SHALE. Pierre shale follows next in succession to the Colorado formation,and is very thickly developed along the Missouri River ab
Water Supply and Irrigation Papers of the United States Geological Survey . 90 m;T chin sew co. R-57 w | W I + 210 (etc.)Representative wells and their depth in feetwhich obtain pump water at base of till MAP OF A PORTION OF Ej Showing depths to w; BY S(! L ...... J L 1 0 0 -50 50 -100 100 - 150 WATER-SUPPLY PAPER N° 34 •?::,+! J60; A f*5o 40-4 ? 9o\ ERX SOUTH DAKOTAit base of* the till 99 IU5 BIEN 8 CO. LITH 250-300 TODD0 GENERAL GEOLOGY. 17 PIERRE SHALE. Pierre shale follows next in succession to the Colorado formation,and is very thickly developed along the Missouri River above theNiobrara chalk. It undoubtedly overlies that formation also in theChoteau Creek Hills, though it has not been distinctly recognized therein exposures or in wells. Upon Turkey Creek, on the east side of , T. 95 N., R. 51 W., a few feet of dark, plastic clay overlies thechalkstone, which doubtless is Pierre. Careful examination willprobably reveal other similar exposures. It is a formation which oftencontains remains of marine reptiles and many cephalopod shells. Theshales are quite calcareous and their fossils are frequently embeddedin large concretions of limestone. TERTIARY DEPOSITS. The only natural exposures in the area under consideration whichmay possibly belong to the Tertiary are beds of a yellow loam
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