TY  - RPRT
TI  - Thickness of Upper Cretaceous rocks from the base of the Niobrara Formation to the base of the Clay Spur Bentonite (top of Lower Cretaceous rocks), Powder River basin, Wyoming and Montana
AU  - J. E. Fox
AU  - Debra K. Higley
PY  - 1987
DO  - 10.3133/ofr87340k
UR  - https://pubs.usgs.gov/publication/ofr87340K
ID  - ofr87340K
ER  -