Regional Tectonics and Seismicity of Eastern NebraskaU.S. Nuclear Regulatory Commission, 1979 - Geology, Structural |
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Bethany Falls Member Canville Member Cass County chert Clay coarse contains algal material contains brachiopods contains crinoids contains fusulinids contains gravel contains Osagia contains pseudo-oolites contains pyrite contains sand dark bluish gray dark brownish gray dark gray dark greenish gray Dennis Formation Douglas counties feet above mean feet east finely crystal finely crystalline Galesburg Formation glauconite Ground-level elevation interbedded with lime interbedded with limestone interbedded with shale irregular crystal irregular crystalline Kansas City Group light brownish gray light gray light greenish gray light tannish gray light to medium mean sea level medium brown medium brownish gray medium gray medium to dark milligal Missouri Series Moines Series Nebraska north section line NORTHEASTERN CASS olive brown olive gray oolites orange gray Pennsylvanian System Quaternary System red mottling reddish brown Road fill Sarpy County Silt Stark Member SW sec Swope Formation Test Hole Total depth west section line Westerville Winterset Member yellowish brown
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Page 1 - This report presents and interprets information that pertains to the geology, structure, tectonics, and seismicity of eastern Nebraska with emphasis on the vicinity of the intersection of the Union and Humboldt Fault zones. Some of the information presented results from a combination of studies begun in earlier years, but the greater part results from studies begun in 1978.
Page 1 - Ivanian age: 2. One new seismograph was installed in eastern Nebraska: 3. Gravity surveys in eastern Nebraska were extended: 4. Ground magnetic surveys in northeastern Cass and eastern Sarpy counties were made and evaluated. Discussion of the results of these studies constitute the remainder of this report.
Page 13 - Regional tectonics and seismicity of eastern Nebraska, Annual Report, June 1, 1976—June 1, Available from National Technical Service, Springfield, VA 22161.