Westward dipping Jurassic and Permian rocks directly underlie the Dakota aquifer in Kansas (Hamilton, 1994). The subcrop of the Jurassic Morrison Formation beneath the Cretaceous is generally in the western part of the state, whereas the Permian subcrop is in the central part (Figure 2). In southwestern Kansas the Morrison consists mostly of sandstone and is a source of fresh water along with the Cheyenne Sandstone. Upper and lower Permian rocks consist of shale, siltstone, sandstone, and bedded salt with minor amounts of limestone and dolomite. Outside of southwestern Kansas, the Morrison, and the Permian and Pennsylvanian sequences form a thick regional aquitard. However, sandwiched within this aquitard is the Cedar Hills Sandstone aquifer which subcrops beneath the lower Dakota aquifer in central Kansas (Table 1, Figure 3). The Cedar Hills Sandstone aquifer consists of the Permian Cedar Hills Sandstone and the sandstones and shaly sandstones at the top of the underlying Salt Plain Formation.
Hattin, D.E., 1962, Stratigraphy of the Carlile Shale (Upper Cretaceous) in Kansas: Kansas Geological Survey Bulletin 156, 155 p. [available online]
Hattin, D.E., 1965, The stratigraphy of the Graneros Shale (Upper Cretaceous) in central Kansas: Kansas Geological Survey Bulletin 178, 83 p. [available online]
Hattin, D.E., 1975, Stratigraphy and depositional environment of Greenhorn Limestone (Upper Cretaceous) of Kansas: Kansas Geological Survey Bulletin 209, 128 p. [available online]
Hattin, D.E., 1982, Stratigraphy and depositional environment of Smoky Hill Chalk Member, Niobrara Chalk (Upper Cretaceous) of the type area, western Kansas: Kansas Geological Survey, Bulletin 225, 108 p.
Hattin, D.E., and Siemers, C.T., 1987, Guidebook Upper Cretaceous stratigraphy and depositional environments of western Kansas (with modifications): Kansas Geological Survey Guidebook Series 3, 55 p. [available online]
Macfarlane, P.A., 1995, The effect of river valleys and the upper Cretaceous aquitard on regional flow in the Dakota aquifer in the central Great Plains of Kansas and southeastern Colorado: Kansas Geological Survey Bulletin 238, pp. 11-30. [available online]
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