A steeply dipping, 300-metre thick limestone lens of late Mississippian age outcrops on the west side of the North Thompson River and continues northwestward up the valley side for 1800 metres. The lens is exposed for a width of 500 metres along a road following the west bank of the North Thompson River, 29 kilometres north of the community of Kamloops. The limestone is contained within a sequence of argillite, quartzite and mafic volcanics of the Carboniferous to Triassic Nicola and/or Harper Ranch groups.

The deposit consists mostly of massive, soft and brittle, white to light bluish grey, sugary textured limestone cut by numerous calcite veinlets. The lens contains some thin shale interbeds, especially along its southwest margin. Two chip samples taken in succession along the road for a total length of 244 metres starting from the northeast edge averaged 52.71 per cent CaO, 0.20 per cent MgO, 4.68 per cent insolubles, 0.29 per cent R2O3, 0.28 per cent Fe2O3, 0.21 per cent MnO, 0.01 per cent P2O5, trace of sulphur and 41.95 per cent ignition loss (Minister of Mines Annual Report 1959, page 170, Samples 5 and 5A).

The limestone was once quarried and burnt on site in a pot kiln at the river bank to produce lime up to 1911.