Named as member (second from base of four members) of Ely Springs Dolostone (redescribed). Type section is in Barn Hills [for which unit probably named] in Confusion Range, SE1/4 NW1/4 sec 26, T21S, R14W, western Millard Co, UT, Great Basin province. Additional outcrops occur at Silver Island Mountains in northwestern UT and at southern Egan Range, Delamar Mountains, Cherry Creek Range and Pancake Range in eastern NV. Consists of dark brownish-gray to medium brownish-gray, microcrystalline to very finely crystalline dolostone; thin to thick bedded; weathers from dark gray to medium light gray; laminated in part. Thickness at type is 156 ft; averages about 180 ft. Overlies Ibex Member (new) of Ely Springs; underlies Lost Canyon Member (new) of Ely Springs. Measured sections. Fossil corals indicate an early Late Ordovician ("late Trenton") age.

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