Named as a member (one of ten) of the Frontier formation for exposures presumably in Spring Canyon, 3 1/4 mi southeast of Coalville, Summit Co, UT on the Uinta uplift. No type locality designated. Overlies the newly named Longwall sandstone member of the Frontier. Underlies the newly named Chalk Creek member of the Frontier. Correlated with the upper part of the Aspen shale and the lower part of the Frontier formation of the Cumberland Gap, Lincoln Co, WY in the Greater Green River basin. Boundary for the Coalville-Cumberland Gap nomenclature not stated. Description states only that the Spring Canyon is a "coaly and carbonaceous sequence." Is about 350 ft thick on outcrop north of Chalk Creek Narrows (sec 1, T2N, R5E) and 375 ft thick in the well near Coalville. Represents the first coastal swamp deposit of the Early? Cretaceous. Cross sections. Correlation chart. Of Albian, Early Cretaceous, and Cenomanian, Late Cretaceous age.

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