| Kiowa Shale | |
|---|---|
| Stratigraphic range: Albian around | |
| Type | Kansas: Formation |
| Sub-units | Longford |
| Underlies | Dakota Formation |
| Overlies |
|
| Lithology | |
| Primary | shale |
| Other | mudstone, lignite (with amber) |
| Location | |
| Country | United States |
| Type section | |
| Named for | Kiowa County, Kansas[1] |
| Named by | Cragin, F.W., 1894[1] |
The Kiowa Formation or Kiowa Shale is a Cretaceous geologic formation in Kansas, diminishing to member status in Colorado and Oklahoma. In Colorado, the Kiowa Shale was classified as a member of the now abandoned[2] Purgatoire Formation.[1] In the vicinity of Longford, Kansas, the local Longford member comprises thinly bedded siltstone, clay, polished gravel, lignite, and sandstone suggests a river and estuary environment.[3]
In other regions, the same strata is called Skull Creek Shale, named after its exposure in Skull Creek, in Wyoming.[4]
- ^ a b c "Geologic Unit: Kiowa". National Geologic Database. Geolex — Significant Publications. United States Geological Survey. Retrieved 2020-09-23.
- ^ "Geologic Unit: Purgatoire". National Geologic Database. Geolex — Significant Publications. United States Geological Survey. Retrieved 2021-03-24.
Use of Purgatoire formation in Tucumcari-Sabinoso area, Guadalupe, Harding, San Miguel, and Quay Cos, northeast NM in the Palo Duro basin and on the Sierra Grande uplift abandoned [should read "areally restricted"].
Term Purgatoire abandoned. Both Lytle and Glencairn are mappable at 1:24,000, and they are separated by a disconformity--the most significant break in the Lower Cretaceous. Authors believe there is no reason to retain them as member rank or to raise the Purgatoire to group rank. - ^ "Geologic Unit: Longford". National Geologic Database. USGS Geologic Names Committee Archives. United States Geological Survey. Retrieved 2020-09-23.
- ^ Cite error: The named reference
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