Pg. 7 (table), 13-20, pl. 1. Skookum formation of Newport group (new). Predominantly argillaceous sandstone and quartzite with carbonate rocks and red and dark-gray argillites. Thickness about 13,000 feet. Contains Moon Hill quartzite member (new) near top. Gradationally overlies No Name argillite (new) of Newport group with transition zone about 400 feet thick; top not exposed. Cut by Marshall diorite (new). Probably = in part Ravalli group, undifferentiated St. Regis, Revett, and Burke formations. Age is pre-Cambrian.
Named from Skookum Peak, [Skookum Creek 7.5-min quadrangle], Pend Oreille Co., northeastern WA.

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 3624-3625).

Pg. 1 (pamphlet). †Skookum Formation of Newport Group of Schroeder (1952) abandoned. Belt rocks here can be correlated directly with those in Coeur d'Alene district, Idaho (see Hobbs and others, 1965, USGS Prof. Paper 478) and around Lake Pend Oreille, Idaho (see Harrison and Jobin, 1963, USGS Bull. 1141-K, and 1965, USGS Geol. Quad. Map GQ-375). Therefore, the names Newport Group, Bead Lake Formation, No Name Argillite, and Skookum Formation proposed by Schroeder (1952, p. 9) are abandoned in favor of the older and more widely used Belt terminology. [The distinctive purple to white quartzites at top of Schroeder's †Skookum Formation (†Moon Hill Quartzite Member) are mapped as Cambrian Addy Quartzite. See geologic map; see also F.K. Miller, Prelim. geol. map Newport No. 2 quad., Pend Oreille and Sevens Cos., WA, Washington Div. Geol. Earth Sci. Geol. Map, GM-8, 1974, and F.K. Miller, Prelim. geol. map Newport No. 3 quad., Pend Oreille, Sevens, and Spokane Cos., WA, Washington Div. Geol. Earth Sci. Geol. Map, GM-9, 1974.]

Source: Publication.