At the Mount Maitland occurrence, two small limestone lenses of the Upper Triassic Vancouver Group, Quatsino Formation outcrop on the flanks of Mount Maitland, 2.5 kilometres north of Kennedy Lake, 50 kilometres west-southwest of Port Alberni. One lens is situated 1.25 kilometres east-northeast of the Mount Maitland peak, while the second is located 2.5 kilometres west of the peak. The west lens strikes 165 degrees for 2000 metres and dips 60 degrees east, while the east lens strikes north for 1750 metres. Both lenses vary up to 250 metres in exposed width. Basalts and andesites of the Upper Triassic Vancouver Group, Karmutsen Formation underlie both lenses. The east lens is overlain by Lower Jurassic Bonanza Group volcanics.