. Geology and water resources of a portion of Southeastern South Dakota . The sandstoneappears on both sides of Twelvemile Creek, following the main streamfor 3 or 4 miles. North of the northeast corner of sec. 34, T. 100 N.,R. 59 W., it has been quarried considerably. The following sectionof a well near Elmspring exhibits this formation more completely: Section in tvell at Elmspring, South Dakota. Feet. (1) Yellow and blue clay (till) with water at 60 feet 83 (2) Sandstone 8 (3) Sand 20 (4) Sandstone and clay, irregularly stratified 20 (5) Blue clay (shale), with one or two strata of sandston
. Geology and water resources of a portion of Southeastern South Dakota . The sandstoneappears on both sides of Twelvemile Creek, following the main streamfor 3 or 4 miles. North of the northeast corner of sec. 34, T. 100 N.,R. 59 W., it has been quarried considerably. The following sectionof a well near Elmspring exhibits this formation more completely: Section in tvell at Elmspring, South Dakota. Feet. (1) Yellow and blue clay (till) with water at 60 feet 83 (2) Sandstone 8 (3) Sand 20 (4) Sandstone and clay, irregularly stratified 20 (5) Blue clay (shale), with one or two strata of sandstone - 116 (6) Eed quartzite 70 All except No. 1 and No. 6 belong to the Dakota formation. The formation thickens by the intercalation of other strata, bothtoward the west and south. Near the James River, at the southernportion of the area, wells indicate that the Dakota formation may befrom 300 to 400 feet in thickness. A characteristic view of the upperportion of the formation, as shown on the Firesteel northwest ofMitchell, is given on PL IX, A. SURVEY. Note: Figures denote depths of borings MAP O F A P ORTI0 iST OF If without + sign quartzite was met with at that depth ShOWlll^ deiDtli All depth areas estimated averages ^^ ? j Thequartzitesurface has many local irregularities ^ -^ , Scl J L \, WATER-SUPPLY PAPER N 34
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