The region is predominantly underlain by basaltic volcanic rocks of the Upper Triassic Karmutsen Formation (Vancouver Group). The basalts range from feldspar porphyritic to augite porphyritic with amygdaloidal and aphanitic varieties also present. Pillow basalt flows are common. Limestone occurs locally as narrow lenses with limited lateral extent.

The Tex showing is underlain by massive and amygdaloidal basaltic flows of the Karmutsen Formation cut by a quartz diorite- granodiorite intrusion. Related quartz veins are concentrated in the contact zone. Mineralization comprising molybdenite, pyrite and chalcopyrite occur as films in fractures in both intrusive and volcanic rocks and in the quartz veins.