The Lone Cabin Creek bentonite showing occurs within an assemblage of Eocene volcanic and sedimentary rocks west of the Fraser fault, equivalent to the Kamloops Group east of the fault. This assemblage comprises an overlap assemblage which, in the region of the showing, rests unconformably on the Cretaceous Spences Bridge Group.

The showing comprises a 10 to 20 metre thick layer of bentonite exposed over a strike length of about 750 metres. Slumping has obscured the stratigraphic relations of the bentonite with adjacent strata.