[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.
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.
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