Geology and water resources of a portion of the Missouri river valley in northeastern Nebraska . fumes, and even to cause slight baking of the shale. Two zones of concretions of carbonate of lime occur in the Carlileshale. The lower zone is a continuous one, and its concretions arelarge, lens-shaped forms, 2 to 8 feet long and 1 foot or more thick(PI. V, ^). This horizon continues at about 50 feet from the top ofthe formation from high in the slope in sec. 32. T. 32. R. 5 E., to apoint between St. James and St. Helena, where the dip takes itdown to the level of the Missouri. The upper zone con
Geology and water resources of a portion of the Missouri river valley in northeastern Nebraska . fumes, and even to cause slight baking of the shale. Two zones of concretions of carbonate of lime occur in the Carlileshale. The lower zone is a continuous one, and its concretions arelarge, lens-shaped forms, 2 to 8 feet long and 1 foot or more thick(PI. V, ^). This horizon continues at about 50 feet from the top ofthe formation from high in the slope in sec. 32. T. 32. R. 5 E., to apoint between St. James and St. Helena, where the dip takes itdown to the level of the Missouri. The upper zone consists of smallerconcretions at a less continuous horizon 8 to 10 feet above the concretions weather out and fall to the base of a sloj^e, wherethey * crack into irregular pieces. In many of them calcite andselenite crystals occur. While selenite crystals may be observed throughout the Graneros,Carlile, Niobrara, and Pierre, they are most abundant on slopes ofthe Carlile formation, especially at the Ionia Volcano or on other U. S. GEOLOGICAL SURVFV WATER-SUPPLY PAPfR NO. 215 PL. V. .1. CARLILE SHALE OVERLAIN BY NIOBRARA NORTHEAST OF JAMES, NEBR.
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Keywords: ., bookcentury1900, bookdecade1900, booksubj, booksubjectwatersupply
