Two lenses of limestone of the Upper Triassic Nicola Group outcrop on the west side of the Thompson River, just north of Martel, 23 kilometres south of Ashcroft.

The first lens consists of a triangular mass of limestone exposed over a width of 90 metres in a roadcut along Highway 1, 800 metres north of Martel. The limestone continues northwest of the highway for 120 metres. The mass is bounded to the west by quartzite and to the northeast by skarn. Indistinct bedding strikes west. The deposit consists mostly of dark grey to black, extensively fractured limestone veined with calcite. The limestone becomes interbedded with argillite near the northern edge of the lens. A 46-metre chip sample taken along the roadcut analysed 53.68 per cent CaO, 0.56 per cent MgO, 2.62 per cent insolubles, 0.50 per cent R2O3, 0.11 per cent Fe2O3, 0.031 per cent MnO, 0.031 per cent P2O5, 0.02 per cent sulphur and 42.50 per cent ignition loss (Minister of Mines Annual Report 1958, page 92, Sample 10).

About 300 metres to the north a second limestone lens is exposed in the highway roadcut over a width of 1300 metres. The lens strikes 155 degrees for 1600 metres and dips southwest. Extensive faulting and folding has taken place. The deposit is comprised of well fractured, uniform black, fine-grained limestone veined with calcite and cut by numerous dikes, which become less frequent to the northwest. A few chert nodules and stringers and some scattered interbeds of argillite are present. A sample of randomly collected chips taken across 300 metres along the south end of the roadcut analysed 54.12 per cent CaO, 0.89 per cent MgO and 1.34 per cent insolubles (Minister of Mines Annual Report 1958, page 92, Sample 11).