TY - RPRT TI - Structure at the base of the Upper Cretaceous Fox Hills Sandstone, Powder River basin, Wyoming and Montana AU - J. E. Fox AU - Debra K. Higley PY - 1987 DO - 10.3133/ofr87340v UR - https://pubs.usgs.gov/publication/ofr87340V ID - ofr87340V ER -