Named for exposures on Kolob Terrace, sec 17, T37S, R10W, Iron Co, UT in the Great Basin province. No type locality designated. Occurs in a small outcrop of gray-weathering porphyritic quartz latite that originated to east. The shape of the outcrop of the Kolob and of the overlying basalt suggest that both occupy a former stream channel that drained either to north or west. The major components of the Kolob are matrix (quartz and orthoclase) 45 to 50 percent, plagioclase 40 to 45 percent, augite 4 to 6 percent, and biotite 2 to 4 percent. Individual crystals range from 2 to 5 mm long; a few crystals are 1.5 cm long. Original areal extent probably restricted to the Cedar Mountain quad. Probably of early Tertiary age--no older than Eocene and no younger than Miocene. Geologic map. Not mapped as a discrete unit. Boulders of Kolob latite recognized in the "older abandoned stream-channel deposits."

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