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]
| Willard Formation Willard Shale | |
|---|---|
| Stratigraphic range: [1] (Virgilian stage)[2] | |
| Type | Formation |
| Unit of | Wabaunsee Group |
| Underlies | Zeandale Limestone |
| Overlies | Emporia Limestone |
| Lithology | |
| Primary | Argillaceous shale |
| Other | Thin arenaceous shales, sand |
| Location | |
| Region | Kansas |
| Country | United States |
| Type section | |
| Named for | Willard, Kansas[3] |
| Named by | Beede[3] |
| Year defined | 1898[3] |
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.[3]
See also
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References
edit- ^ a b P. H. Heckel (2013). "Pennsylvanian stratigraphy of Northern Midcontinent Shelf and biostratigraphic correlation of cyclothems". Stratigraphy. 10 (1–2): 7, TEXT-FIGURE 4. Retrieved 2024-06-02.
- ^ a b "Geologic Unit: Willard". National Geologic Database. Geolex – Significant Publications. United States Geological Survey. Retrieved 2024-06-02.
- ^ a b c d Jewett, John M. (1941). The Geology of Riley and Geary Counties, Kansas, Kansas Geological Survey Bulletin 39. University of Kansas Publications, State Geological Survey of Kansas.
The Willard formation, named from a village in Shawnee County, Kansas, was differentiated by Beede in 1898. In some reports of the Kansas Geological Survey an error in correlation of units appears, but the Willard is now recognized as the shale between the Elmont and Tarkio limestones.
- ^ Jewett, John M. (1941). The Geology of Riley and Geary Counties, Kansas, Kansas Geological Survey Bulletin 39. University of Kansas Publications, State Geological Survey of Kansas.
Distribution--This shale is exposed in a small area on both sides of Deep Creek in southeastern Riley County. It can easily be seen at Pillsbury Crossing ....
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