Named as a member of Green River Formation for exposures in the Middle Fork in area north of town of Soldier Summit. Type section designated and measured in sec 18, T10S, R8E, Utah Co, UT on the Wasatch uplift. Extent beyond Soldier Summit not discussed. Overlies Tabbyune Creek Tongue (new name) of Colton Formation. Underlies delta facies (mostly hard, sandy and micaceous grayish- or brownish-green mudstone) of Green River Formation. Consists mostly of tan-brown, flaky to light-gray paper shale interbedded with brown, tan-gray limestone and brown marlstone that is mostly homogeneous with no evidence of bedding. Contains poorly exposed mollusk shells and ostracods. Some limestone beds are irregularly thin bedded; some contain concretions; some are silty and clayey. Top of member placed at top of persistent oil-shale bed that lies 55 ft below a horizon with many fossil tracks. Stratigraphic chart. Eocene age.

Source: GNU records (USGS DDS-6; Denver GNULEX).