The occurrence consists of two beds of limestone of the Pennsylvanian to Permian Azure Lake Formation, Buttle Lake Group, at the northern margin of the Buttle Lake uplift. The beds are folded into a north trending syncline which outcrop along the southeast slope of Mount McBride for 9 kilometres, just west of Buttle Lake.

The limestone beds are intercalated with and underlain by volcanic breccia, tuff and argillite. The uppermost bed is overlain by basaltic flows of the Upper Triassic Vancouver Group, Karmutsen Formation. The two beds are segmented by numerous northwest trending faults. See H-W (092F 330) for a discussion of the revised nomenclature of Buttle Lake uplift stratigraphy.