Oriel, Steven S. 1923-1986 Uppermost cretaceous and tertiary stratigraphy of fossil basin, Southwestern Wyoming / by Steven S. Oriel and Joshua I. Tracey. -- Washington : United States Government Printing Office, 1970 - 53 p. -- (Geological Survey Professional Paper ; 635). Subjects--Topical Terms: EstratigrafíaTerciarioWyoming Universal Decimal Class. No.: 551.78(787)"623"