Isolated sandstone bodies encased in marine mudstones have proved difficult to explain, especially those that are not easily incorporated into conventional facies models. The Hatch Mesa succession (Campanian, lower Kenilworth Member) is a marine mudstone-encased, turbiditic sandstone body, 6 to 20 m thick, that is exposed along a 7-km-long outcrop belt, approximately 15 km east of Green River, Utah, U.S.A. Various interpretations of depositional environment and regional correlation have been proposed over the past 20 years. A sedimentological analysis of the Hatch Mesa succession suggests deposition as a storm-influenced, prodelta turbidite complex on the shallow inner shelf, between fair-weather and storm wave base. This interpretation [...]