Black, siliceous limestone of the Triassic Toad, Grayling and Liard formations outcrops in a small roadcut along the John Hart Highway (Highway 97), 2.1 kilometres northeast of the Pine River bridge on the west limb of a northwest trending anticline. A chip sample taken across 30.5 metres contained 18.1 per cent CaO, 8.30 per cent MgO, 48.8 per cent insolubles, 0.64 per cent R2O3, 0.63 per cent Fe2O3, 0.03 per cent MnO, 0.06 per cent sulphur and 0.27 per cent ignition loss (Minister of Mines Annual Report 1957, page 86).