Oligocene pumiceous ask interbedded with paleolandslide material that has ash matrix and clasts of quartzite and granite. Beaverhead County, Montana. nd.

Album caption: Oligocene pumiceous ask interbedded with paleolandslide material that has ash matrix and clasts of quartzite and granite. Exposure on north side of ridge north of Fourth of July Creek (NE ¼ sec. 14, T. 2 S., R. 12 W.) A clast-free layer occurs above large boulder next to man’s head. Another occurs just to left of tip of tree’s shadow below protruding block near top of picture. Published as figure 15.