TY  - RPRT
TI  - Thickness of Upper Cretaceous rocks from the base of the Niobrara Formation to the top of the Frontier Formation, including the Carlile Shale, Greenhorn Formation, and Sage Breaks Shale, Powder River basin, Wyoming and Montana
AU  - James E. Fox
AU  - Debra K. Higley
PY  - 1987
DO  - 10.3133/ofr87340l
UR  - https://pubs.usgs.gov/publication/ofr87340L
ID  - ofr87340L
ER  -