Pg. 227 (table 1), 229, 235-238. Mowich group consists of three formations (ascending): Robertson, Suplee, and Nicely black shale (all new). Total thickness less than 500 feet. Group steeply folded; in some localities, inclined more than 45 deg. and in some places nearly vertical. Unconformably underlies Colpitts group (new); overlies Donovan formation (new). Age is Early Jurassic.
Type area: along headwaters of South Fork of Beaver Creek, 7 mi southeast of Suplee Post Office, in secs. 26, 27, 28, and 29, T. 18 S., R. 26 E., Crook Co., east-central OR. Named from Mowich Mountain.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2644).

Pg. 4, 30, 39-40. Mowich Group. Defined by Lupher (1941) after exposures on limbs of Mowich anticline, [Mowich Mountain], in Suplee-Izee district, central Oregon. He designated exposures in the headwaters of South Fork of Beaver Creek, 7 miles southeast of Suplee Post Office, in secs. 26, 27, 28, and 29, T. 18 S., R. 26 E., as the type [area]. He divided Mowich Group into Robertson Formation, Suplee Formation, and Nicely Shale. The Mowich Group of Dickinson and Vigrass (1965) is essentially same as that of Lupher, but includes Hyde Formation. Near juncture of Freeman Creek and South Fork of Beaver Creek (12 miles southwest of type locality), Dickinson and Vigrass (1965) mapped strata, assigned to Hyde Formation by Lupher (1941), as Basey Member of Snowshoe Formation; they mapped Lupher's (1941) "incertae sedis" beds as Hyde Formation of Mowich Group. (See also entries under Basey and Hyde.)
See also Dickinson, W.R., and Vigrass, L.W., 1965, "Geology of the Suplee-Izee area, Cook, Grant, and Harney Counties, Oregon," Oregon Dept. Geol. and Min. Ind. Bull., no. 58, 109 p., geol. map (scale 1:42,000).

Source: Publication.