Willard Shale

The Willard Formation, also referred to as Willard Shale, is a Late-Carboniferous geologic formation in Kansas, extending into Nebraska, Iowa, Missouri, and Oklahoma.

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, about 25 mile west of the type location at Willard, Kansas.