Radioactivity and uranium content, Sharon Springs member of the Pierre shale, Kansas and Colorado

Landis, Edwin R.

doi:10.3133/b1046l

1959

DOI: 10.3133/b1046l

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Radioactivity and uranium content, Sharon Springs member of the Pierre shale, Kansas and Colorado

Edwin R. Landis¹

Abstract: PLATE 35. Columnar sections of Sharon Springs member of Pierre shale in Wallace and Logan Counties, Kans. 36. Columnar sections of lower part of Pierre shale in Cheyenne, Kiowa, Crowley, and Pueblo Counties, Colo. 37. Columnar sections of lower part of Pierre shale in Las Animas County, Colo. 38. Gamma-ray logs of lower part of Pierre shale and upper part of Niobrara formation in eastern Colorado.

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Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas

Gill¹,

Cobban²,

Schultz³

1972

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The Sharon Springs Member of the Pierre Shale is a widespread unit that can be recognized readily in outcrops by its distinctive lithologic character and in the subsurface by electric and gamma-ray well-log characteristics. The Sharon Springs Member is in Kansas, Nebraska, North and South Dakota, and parts of Colorado, Wyoming, Montana, and eastern Utah. Its type locality is in Wallace County, Kans., where the member is about 215 feet thick and consists of three units: a lower dark soft shale unit 115 feet thick, a middle hard organic-rich shale unit 90 feet thick, and an upper hard slightly phosphatic shale unit about 10 feet thick. The Sharon Springs contains abundant vertebrate remains but few mollusks. Minerals in the Sharon Springs Member, as determined from well cuttings, are predominantly clay minerals but include about 25 percent quartz and several percent each of pyrite, dolomite, organic matter, and, in the lower part where the member grades into the Niobrara Formation, calcite. The most abundant clay mineral is mixed-layered montmorilloniteillite; there are lesser amounts of illite, kaolinite, and chlorite. Pyrite, dolomite, and chlorite are leached from outcrops. Bentonite beds in the Sharon Springs contain unusually large amounts of kaolinite and beidellite with interlayered hydrated aluminum complexes in comparison with the usual montmorillonitic bentonites in other parts of the Pierre Shale. The rare mineral basaluminite occurs as white earthy lumps at the top of the Sharon Springs Member. Semiquantitative spectrographic data indicate that most trace elements occur in the clay component of the shale or in closely associated heavy clastic grains. Iron, nickel, cobalt, and molybdenum are concentrated in pyrite. Molybdenum and probably uranium and silver seem strongly concentrated in organic matter. Strontium is concentrated in calcite. HISTORICAL BACKGROUND Loc. Location 1Mohler (1889, map on page 278) showed McAllaster to be along the Union Pacific Railroad, just north of the center of sec. 23, T. 12 S., R. 37 W., and Sheridan to be along this railroad east of the North Fork of Smoky Hill River in about the W% sec. 8, T. 12 S., R. 36 W.

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Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas

Gill¹,

Cobban²,

Schultz³

1972

Professional Paper

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Characterization of streamflow, water quality, and instantaneous dissolved solids, selenium, and uranium loads in selected reaches of the Arkansas River, southeastern Colorado, 2009-2010

Ivahnenko¹,

Ortiz²,

Stogner³

2013

Scientific Investigations Report

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Radioactivity and uranium content, Sharon Springs member of the Pierre shale, Kansas and Colorado

Cited by 2 publications

References 8 publications

Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas

Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas

Characterization of streamflow, water quality, and instantaneous dissolved solids, selenium, and uranium loads in selected reaches of the Arkansas River, southeastern Colorado, 2009-2010

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