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Generalized Stratiaraohic-Column Sec 25 T3N R64W <br />ONUndifferentiated Eolian sands - V. fine to medium <br />400 _ grained buff to brown with yellow-orange arkosic <br />O unconsolidated sands in upper zone. Grades to <br />silty clayey sands at base. Weathered and <br />locally saturated. <br />Clay, yellow brown -gray moderately weathered, <br />occasional silty sandy layers resistant siltstone <br />Q1 - sandstone.concreations <br />Clay, gray, "blue- with yellow clay clasts. <br />Gypzumniferous clay shales with intermediate <br />resistant siltstone layers (2" to 4" thick). <br />Ground water production limited and isolated. <br />Observed discharge rates <lgpm. Resistant <br />Sandstone - siltstone concreations. <br />Sandstone, yellow brown calcareous interbedded <br />dark gray sandy shale with massive white <br />sandstone. Gradational contact with underlying <br />Pierre shales. (Fox Hills Formation). <br />•� Shale, dark gray black, marine (Pierre Shale). <br />-44- <br />hard, dark brown to black. Poor cleat <br />development, semi concoidal fracture, friable <br />4700'° <br />.Coal, <br />when dry, caliche and minor pyrite in points. <br />.•�,:;;': <br />Gray clay clasts upper 1 ft. <br />Resinous-lignitic. H23 gas production from <br />•� <br />saturated coal near edge of deposits. <br />LLI <br />Clay, gray, dark gray with minor very fine <br />grained well sorted gray sands, within 2 ft. <br />W <br />below coal. Thin layers of coal and black, <br />J <br />:.. <br />;.. <br />friable shales thinly interbedded. Occasional <br />LU <br />r;;; <br />thin sandstone and siltsone beds. <br />450 <br />Sandstone, gray -buff with occasional soft <br />....._ <br />carbonaceous shale. <br />Sandstone, yellow brown calcareous interbedded <br />dark gray sandy shale with massive white <br />sandstone. Gradational contact with underlying <br />Pierre shales. (Fox Hills Formation). <br />•� Shale, dark gray black, marine (Pierre Shale). <br />-44- <br />