Five lenses of limestone outcrop in the sides of a valley just southwest of Walhachin, 21.5 kilometres east of Cache Creek. The lenses are contained within a sequence of mafic volcanics, quartzite, argillite and greywacke of the Upper Triassic Nicola Group.

One 15 to 23-metre thick lens outcrops for 60 metres along the west side of the valley 750 metres due south of the Walhachin road bridge. The lens is composed of extensively fractured, dark grey limestone with inclusions of chert and dolomite. A 61-metre chip sample taken along the length of the lens analysed 52.40 per cent CaO, 0.61 per cent MgO, 3.76 per cent insolubles, 1.16 per cent R2O3, 0.37 per cent Fe2O3, 0.543 per cent MnO, 0.04 per cent P2O5, 0.03 per cent sulphur and 42.01 per cent ignition loss (Minister of Mines Annual Report 1958, page 92, Sample 12).