Type Sedimentary Thickness 500-1000 m Primary Slate Overlies Frontier Formation | Sub-units see text Country United States Named for Cody Underlies Mesaverde Formation | |
Region Montana folded belt province, Central Montana uplift, Big Horn basin, Powder River basin, Wind River basin Extent Wyoming, Idaho, Montana | ||
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.
The formation is divided into many members (alphabetical):
References
Cody Shale Wikipedia(Text) CC BY-SA