The Chase Group is a sedimentary rock unit of Lower Permian age. It is defined in east-central Kansas and extends into Oklahoma and Nebraska as well as the Colorado subsurface where it is undivided. The unit was assigned geologic group rank around 1902.^[2]

Key Information

Chase Group
Stratigraphic range: Lower Permian
Type	Group
Sub-units	Nolans Limestone Odell Shale Winfield Limestone Doyle Shale Barneston Limestone Matfield Shale Wreford Limestone
Underlies	Sumner Group
Overlies	Council Grove Group
Lithology
Primary	Limestone, shale, mudstone
Other	Flint, paleosols
Location
Region	Kansas with Oklahoma and Nebraska
Country	United States
Type section
Named for	Chase County, Kansas[1]
Named by	C.S. Prosser[1]
Year defined	1895
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1. ^ ^{a b} Prosser, C.S., 1895, The classification of the upper Paleozoic rocks of central Kansas: Journal of Geology, v. 3, nos. 6-7, p. 682-705, 764-800.
2. ^ "Geologic Unit: Chase". National Geologic Database. Geolex — Significant Publications. United States Geological Survey. Retrieved 2021-11-28.

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