File:Geology and water resources of a portion of the Missouri river valley in northeastern Nebraska (1908) (14591317169).jpg

Identifier: geologywaterreso00cond (find matches)
Title: Geology and water resources of a portion of the Missouri river valley in northeastern Nebraska
Year: 1908 (1900s)
Authors: Condra, Geo. E. (George Evert), 1869-1958
Subjects: Geology Water-supply
Publisher: Washington, Govt. Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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^ developed. The formations in this area are all of sedimentary origin and be-long to the Cretaceous, Tertiary, and Quaternary systems. The Cre-taceous strata, w^hich are the lowest exposed, consist of beds wide inextent and nearly horizontal in position or with a slight dip to thewest. They, are composed of clay, chalk, limestone, and sandstone,which were for the greater part marine accumulations of mud, minutecalcareous shells, and sand. These formations outcrop extensivelyalong Missouri River and other streams, as show^n in PL II (inpocket), and by well records their relations at other places are known.The total thickness of the Cretaceous beds in the w^estern part of BoydCounty is thought to be about 1,400 feet. From records of deep bor-ings at Ponca and Sioux City it is knowm that the Carboniferous lime-stones also underlie the region, beginning at a depth of about 545 feetat Ponca, Nebr., and 335 feet at Sioux City, low^a.
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ii ii m ii; STRATIGRAPHY. / The following sections represent the succession at certain typicallocalities: Section hcJoic the moutfi of Aoira Creek, Diion County, yebr. Feet. Loess, extends 98 feet higher in slope; exposed 7-3G Glacial till 22 Greenhorn limestone: Limestone, slabby, with many remains of Inoccraniu.s luljiatiis 5§ Claj% dark, sandy, with some chalk 1 Limestone, slabby, containing Inoccrami 4 Limestone, blnish, chalky, weathers to a light color resembling Nio-brara chalk rock: contains some Inoccrami 9 Graneros shale: Clay, blnish and somewhat chalky above, dark below, contains iron pyrites concretions, and sulphate of iron as a powder 49* Clay, dark, at places carbonaceous above, usually sandy, containing concretions of iron pyrites and marcasite and rosettes of selenite__ 7 Dakota sandstone: Sandstone, light to rusty color, porous, and soft; with root marks.Rusty iron concretions occur near the center and base. The beds thicken and dip westward 7-10 Clay, dark, contai

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