From a kilometre north of Clemes Creek to a kilometre north of Gorge Creek, landslide debris underlies Deadman River and mantles the valley walls up to 1070 metres in elevation. The most extensive slides are from the east or dip slope side of the valley where an approximately 60-metre thick bentonite layer (see Split Rock, 092INE170), with intercalated fine volcanic breccia layers, outcrops for a kilometre along strike near the base of slope. On the west side of the valley from Barricade to Gorge creeks, bentonitic volcanic breccia and bentonite-rich lenses up to a few tens of metres in thickness are scattered throughout the andesite breccia that underlies the sedimentary lens. CANMET Summary Report 1918 and Geological Survey of Canada Memoir 249 describes bentonite near the mouth of Gorge Creek (Gorge Creek showing) which probably applies to the bentonite-rich layers in andesite breccia at 750 metres elevation (Fieldwork 1987). Hostrocks are Eocene Kamloops Group volcanics and sediments.