“…The uppermost unit in the study area, the Parachute Creek Fm., contains bituminous sands (tar sands), and is underlain by the Douglas Creek member of the Green River Fm., and Eocene Renegade Tongue of the Wasatch Fm. (Kimball, 1981;Lindskov and Kimball, 1985;Holmes and Kimball, 1987). The Douglas Creek and Renegade Tongue outcrops are significant because both formations contain a large freshwater aquifer, the Douglas Creek aquifer, where they exist at depth to the north (Holmes and Kimball, 1987).…”