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Stratigraphy and geochemistry of a new section of the Ninnescah Shale (Lower Permian), Kingman County, Kansas
Dalton, Jack
Dalton, Jack
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Dalton_2025.pdf
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Authors
Dalton, Jack
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Parcell, William C.
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2025-04-11
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Dalton, J. 2025. Stratigraphy and geochemistry of a new section of the Ninnescah Shale (Lower Permian), Kingman County, Kansas. -- In Proceedings: 21st Annual Symposium on Graduate Research and Scholarly Projects. Wichita, KS: Wichita State University
Abstract
The Ninnescah Shale is one of the most distinctive rock units in south-central Kansas. Deposited in a mix of marginal marine and coastal nonmarine environments during the Lower Permian, from approximately 280-270 million years ago, the Ninnescah can be recognized by its abundant beds of red shales and siltstones. At some localities, these red beds are interlayered with thin horizons of blue-gray shale. In this study, a new exposure of the Ninnescah Shale is reported in which thin beds of red shales and occasional siltstones are interlayered with thicker beds of blue-gray shale. Lithologic traits of these beds indicate that the section belongs to the lower unnamed member of the Ninnescah Shale, underlying the upper Runnymede Sandstone. Field observations have indicated that the alternating coloration of the shale beds is primarily the result of oxidation from the downwards movement of meteoric fluids. Additionally, chemical analysis with a pXRF has indicated that some of these fluids may have caused minor silicification of the red shales. Red shales from the Ninnescah have long been used as construction materials for unpaved roads in Kingman and western Sedgwick Counties, and so a refined understanding of the unit's stratigraphy and geochemistry can more accurately pinpoint further sources of the valuable material.
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Presented to the 21st Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Rhatigan Student Center, Wichita State University, April 11, 2025.
Research completed in the Department of Geology, Fairmount College of Liberal Arts and Sciences.
Research completed in the Department of Geology, Fairmount College of Liberal Arts and Sciences.
Publisher
Wichita State University
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Book Title
Series
GRASP
v. 21
v. 21