Geologic Formations, continued
Permian SystemUndifferentiated redbeds
Character--Rocks belonging to the Permian system are not exposed in Finney and Gray counties and, as the only data available are the logs of a few oil and gas tests drilled in this area, no detailed description of the lithology can be given. The upper part of the Permian system (Guadalupian-Leonardian series), which is chiefly nonmarine in origin, is composed of red siltstone, shale, and sandstone with lesser amounts of salt, gypsum, anhydrite, limestone, and dolomite. The lower part, or Wolfcampian series, is largely marine in origin and is composed chiefly of limestone, dolomite, and shale, but also contains some sandstone and anhydrite.
Distribution and thickness--Permian rocks underlie all of Finney and Gray counties. The nearest outcrops, however, are in Meade and Clark counties, Kansas, where the upper series (Guadalupian) of strata is exposed at the surface. The thickness of the Permian rocks as obtained from the logs of oil tests is approximately 2,300 feet in Finney County. No data are available on the thickness of the Permian strata in Gray County, but it is thought to be somewhat thicker there than in Finney County. Approximately 3,000 feet of Permian sediments are reported to underlie Ford County (Waite, 1942, p. 135), which adjoins Gray County on the east.
Correlation--The Permian strata underlying Finney and Gray counties are known to include representatives of all groups from the Whitehorse to the Admire. The Quartermaster group, which overlies the Whitehorse group and includes the Taloga formation and the Day Creek dolomite, may be present in some areas, but has not been encountered in any of the oil and gas wells drilled to date. Norton (1939, p. 1763) has recognized beds younger than the Whitehorse in an oil well drilled about 3 miles north of Finney County, in sec. 14, T. 20 S., R. 33 W., Scott County.
The classification and nomenclature of the Permian strata used in this report follow those given by the State Geological Survey of Kansas (Moore, 1940, pp. 42-44) and differ somewhat from the classification and nomenclature used in other reports.
Water supply--No wells obtain water from Permian beds in Finney and Gray counties. Deep wells drilled to the Permian probably would find some water in the sandstone formations, but experience in other areas indicates that the water would be too highly mineralized for most uses. The great depth and the poor quality of the water has prohibited the drilling of water wells to the Permian. In most places in Finney and Gray counties, there is an abundance of water in the overlying rocks.
Kansas Geological Survey, Finney and Gray County Geohydrology|
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Web version April 2002. Original publication date Dec. 1944.