The area is underlain by poorly exposed rocks of the Mississ- ippian to Triassic Cache Creek Group which, in the region, consists mainly of mafic metavolcanic rocks, argillaceous metasediments and ultramafic bodies, now sheared and altered. Overlying the Cache Creek Group are Miocene plateau basalt and Pleistocene till.

The showing consists of a residual clay deposit from altered argillite in road cuts. The clay is of cone 19 and although it burns white, it lacks plasticity and, therefore, is of doubtful ceramic value.