Named for Sohare Creek 2 mi north of north end of measured type section in secs 15, 16, 22, and 27, T42N, R112W, Teton Co, WY in Yellowstone province. Rocks assigned to Sohare were called coaly sequence (lower) and lenticular sandstone and shale sequence (upper). Coaly sequence only mappable locally, and intertongues with overlying sequence. Geologic map. Is exposed on east side of Jackson Hole and on both flanks of Gros Ventre Range. Thickness varies from 5,000 ft south of Gros Ventre Range to 4,104 ft at type to eroded edge just south of Yellowstone Park. Divisible into coal member or lower part, and upper part. Coal member composed of gray, tan to brown, bentonitic shale, tan bentonite, gray to tan, fine- to medium-grained, thin-bedded, lenticular, cross-bedded, ledgy sandstone, brown to gray marlstone and coal. Upper part composed of gray, buff, white, soft, fine- to medium-grained sandstone that may be massive, lenticular and cross-bedded, gray to tan, carbonaceous shale, gray marlstone, and gray claystone. Overlies Bacon Ridge Sandstone (contact placed at top of conspicuous sandstone about 50 ft above a persistent bentonite that has marine invertebrates). Underlies Mesaverde Formation (contact placed at base of basal white cliff-forming sandstone). Has nonmarine leaves. Underlying Bacon Ridge has a fauna of middle Niobrara age. Assigned to the Late Cretaceous.

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