The Willard Formation, also referred to as Willard Shale, is a Late-Carboniferous geologic formation in Kansas, extending into Nebraska, Iowa, Missouri, and Oklahoma.
[2][1] The full face of the formation is exposed for easy access on the north bank of Deep Creek at the public park, Pillsbury Crossing, in southeast Riley County, Kansas,[4] about 25 miles (40 km) west of the type location at Willard, Kansas.
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