Snowcrest Range Group (PAMsr) - Conover Ranch Formation: Red siltstone and mudstone with minor silty limestone and sandstone beds. Thickness 35 m (115 ft). Lombard Formation: Gray, silty limestone with minor black shale. Thickness120 m (394 ft). Kibbey Formation: Yellow siltstone, sandstone, and mudstone with minor silt limestone in lower part. Thickness 80 m (262 ft). Tendoy Group (Mtd) - McKenzie Canyon Formation: Gray, chert-bearing limestone and solution breccia. Marine. Thickness 140 m (460 ft). Mission Canyon Formation: Light gray, chert-bearing limestone and brown dolomitic limestone. Shallow marine. Thickness 180 m (590 ft). Middle Canyon Formation (Mmd): Dark gray, silty limestone with chert beds and nodules. Shallow marine. Thickness at type section 335 m (1,100 ft). Paine Formation: Dark gray, silty limestone with solution breccia zone. Shallow marine. Thickness 230 m (755 ft).
Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract between the U.S. Geological Survey and the Montana Bureau of Mines and Geology.