Pg. 199-215. Chamberlain shales. Dark, siliceous, and in places arenaceous shales, 1,500 feet thick, overlying Neihart quartzite and sandstone and underlying Newland limestone. Age is pre-Cambrian (Belt).
Type localities are on ridges between Chamberlain and Sawmill Creeks, southeast of Neihart, [Cascade Co.], Little Belt Mountains, central southern MT.

Source: US geologic names lexicon (USGS Bull. 896, p. 395).

Coarse-grained arkose and conglomerate of the LaHood Formation crop out in a narrow zone from the northern half of the Bridger Range to and across the Highland Mountains, in Jefferson Co, MT, Northern Rocky Mountain region. Grades northward into fine-grained carbonate, argillite, siltite, and quartzite of Belt Series. Belt rocks included are Neihart Quartzite, Chamberlain Shale (of Sweetgrass arch area), Prichard Formation, Newland Limestone, and lower part of Greyson Shale. Chamberlain assigned to the Precambrian.

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

Used in Glacier Park area in Northern Rocky Mountain region. Stratigraphic position and correlation with other Precambrian formations of the Belt Supergroup of the U.S. and in the Purcell Supergroup in Alberta and British Columbia, Canada shown on figures 4, 5, and 8.

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