Figure 1. Generalized columnar section of geologic units in study area (Gillespie, 1992)
|300||Unconsolidated deposits of sand
and gravel with interbedded
lenses of clay, silt, and caliche.
Windblown silt (loess) and dune
sand occur at the surface over
most of the area. Stream-laid
deposits (alluvium) of late
Quaternary age range from clay to
gravel and occur along the South
Fork Ninnescah River valley
|Permian||Lower Permian||Salt Plain Formation||300||Reddish-brown sandy siltstone
nad fine-grained sandstone
| ||Harper Sandstone||250||Brownish-red siltstone with a few
thin beds of silty sandstone
| ||Stone Corral Sandstone||20||White and light-gray anhydrite
| ||Ninnescah Shale||400||Red and grayish-green shale,
siltstone, and very fine-grined
silty sandstone. A 20 to 50 foot
thick salt member, when present,
is about 50 feet below the top
of the formation
| ||Wellington Formation||500||Calcareous gray and blue shale,
containing thin beds of anhydrite,
gypsum, and limestone. The
Hutchinson Salt Member, when
present, is near the middle of
Figure 2. Broad-scale map of the Cimarron Salt with the location of Stafford and Pratt Counties highlighted (modified from Bayne, 1972).
The study discussed here, centered on southern Stafford and northern Pratt Counties, was undertaken in order to improve our understanding of the north-eastern edge of the salt body (Figures 2 and 3). The project involves using more than 500 well logs to map the extent and thickness of the Cimarron Salt.
Figure 3. Location of the study area.
Figure 4. Gamma and induction logs from Deutsch Oil Co. #2-27 Scholes (27-27S-11W).
The horizon information from the well data were entered into a spreadsheet and then were contoured using the program Surface III on a workstation.
Figure 5. Isopach map of the Lopwer Cimarron Salt.
The top of the overlying Stone Corral Formation was also mapped (Fig. 6). A linear trend analysis was performed on these data. The results of the removal of the linear trend are shown in Figure 7. The areas of residual highs correspond closely to the overall shape of the underlying salt body, making trend analysis a possible tool for discernment of underlying salt bodies.
Figure 6. Contour map of the top of the Stone Corral Formation (relative to sea level).
Figure 7. Positive residuals of linear trend analysis of the top of the Stone Corral Formation.
Cobb, P. M. (1980). The distribution and mechanisms of salt water intrusion in the fresh water aquifer and in Rattle Snake Creek, Stafford Co., KS: KGS Open File Report 80-17, pp. 1-176.
Cobb, P. M. (1983). Current and possible future hazards to irrigation in Kansas: an overview of salt water intrusion from Permian formations: KGS Open File Report 83-3, pp. 1-12.
Gillespie, J. B., and G. D. Hargadine (1992). Geohydrology and saline ground water discharge to the south fork Ninnescah River in Pratt and Kingman Counties, south=central Kansas: Unpublished USGS Water Resources Investigations Report, pp. 1-93.
Jordan, L. and D. L. Vosburg (1963). Permian salt in the Anadarko Basin, Oklahoma and Texas: Oklahoma Geological Survey Bulletin No. 102, pp. 1-76.