Английская Википедия:Cody Shale
Материал из Онлайн справочника
The Cody Shale is a Late Cretaceous geologic formation. It is mapped in Wyoming, Idaho, and Montana.
The formation is described by W.G. Pierce as follows: upper part is buff, sandy shale and thinly laminated buff sandstone; lower part is dark gray, thin-bedded marine shale.[1]
The formation is divided into many members that vary regionally. Alphabetically:[2]
- Ardmore Bentonite Beds (WY)
- Belle Fourche Member (MT, WY)
- Carlile Member (MT, WY)
- Claggett Member (MT, WY)
- Eldridge Creek Member (MT)
- Gammon Ferruginous Member (MT, WY)
- Greenhorn Calcareous Member (MT)
- Niobrara Member (MT, WY)
- Sage Breaks Member (WY)
- Shannon Sandstone Member (MT, WY)
- Steele Member (WY)
- Sussex Sandstone Member (WY)
- Telegraph Creek Member (MT, WY)
- Wallace Creek Tongue (WY)
Certain members rise to formation rank in other areas; for example, the Greenhorn is classified as a formation in a number of states, particularly in Colorado and Kansas.
References
Шаблон:US-geologic-formation-stub
- ↑ Pierce, W.G., 1997, Geologic map of the Cody 1 degree x 2 degrees quadrangle, northwestern Wyoming: U.S. Geological Survey, Miscellaneous Geologic Investigations Map I-2500, scale 1:250000.
- ↑ Шаблон:Cite web