The Central Empire Valley bentonite showing occurs within a faulted assemblage of Eocene rhyolitic tuff west of the Fraser fault, equivalent to the Kamloops Group east of the fault. These volcanics comprise an overlap assemblage on the Methow Terrane of the Intermontane belt.

The bentonite showing occurs in proximity to a brownish red basalt flow which can be traced northwards along strike for about two kilometres. Where the basalt is exposed to the north, it is overlain by rhyolitic crystal tuff with interbedded bentonite layers. It is probable that the bentonite at this locality is continuous along strike with the bentonite to the north at the Empire Valley Road showing (092O 113).