Council Grove Group

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Council Grove Group
Stratigraphic range:
Carboniferous-Permian boundary[1]
TypeGroup
Sub-unitsSpeiser Shale

Funston Limestone
Blue Rapids Shale
Crouse Limestone
Easly Creek Shale
Bader Formation
Stearns Shale
Beattie Limestone
Eskridge Shale
Grenola Limestone
Roca Shale
Red Eagle Limestone
Johnson Shale

Foraker Limestone
UnderliesChase Group
OverliesAdmire Group
Location
RegionMidcontinent (Kansas, Nebraska, Oklahoma, Colorado (subsurface) )
CountryUnited States
Type section
Named forCouncil Grove, Kansas

The Council Grove Group is a geologic group in Kansas, Oklahoma, and Nebraska as well as subsurface Colorado. It preserves fossils dating to the Carboniferous-Permian boundary.[1][2] This group forms the foundations and lower ranges of the Flint Hills of Kansas, underlying the Chase Group that forms the highest ridges of the Flint Hills.

The Group particularly consists of megacyclothems alternating between massive mudstone paleosols and massive shallow marine limestone. The sequences of these alternations correlate with the ~400,000 year component of Milankovitch cycles. A number of the limestones have minor flint-filled marine animal burrows, anticipating the massive flint beds of the Chase Group.

With the exposure of the group's lower formations in the 1993 flooding,[3] the entirety of the Council Grove Group, from hillcrest Speiser Shale down to pond-level Americus limestone, is exposed for study from top to bottom in the Tuttle Creek Lake Spillway.[4]

See also

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References

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Further reading

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  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
This report encyclopedically covers the units exposed in the Tuttle Creek Lake Project area, predominantly the lower Permian.


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