A 250 to 350 metre wide band of limestone of the Upper Triassic Quatsino Formation (Vancouver Group) extends for 5 kilometres east-southeast from Kains Lake, approximately 11 kilometres west of Port Hardy. The band is bounded to the southwest by overlying argillite of the Upper Triassic Parsons Bay Formation (Vancouver Group) and to the northeast by underlying basalts of the Upper Triassic Karmutsen Formation (Vancouver Group). Four grab samples averaged 54.29 per cent CaO, 0.04 per cent MgO, 1.64 per cent insolubles, 0.17 per cent R2O3, 0.14 per cent Fe2O3, 0.060 per cent MnO, 0.02 per cent P2O5, 0.03 per cent sulphur and 43.40 per cent ignition loss (Minister of Mines Annual Report 1968, p. 318, Sample 1).