Thin phosphorite beds occur at 5 horizons in the upper 100 metres of a nodular limestone unit of the Cambrian to Ordovician Kechika Group. Phosphate is present as microcrystalline coatings, 1 to 10 millimetres thick, around limestone nodules, and as phosphatized fossil debris (trilobites) in beds 5 to 50 centimetres thick. Some pelletal and oolitic phosphate is also present. Phosphatic beds are easily recognized by their blue-weathering surfaces and black colour, contrasting with the pale grey of the host limestone. Phosphatic coatings, 1 millimetre or less thick, surround limestone nodules in beds 2 or more metres thick. Phosphate is also reported to be present in the lower banded limestone unit. It occurs as thin (1 to 5 centimetres) sea floor pavements with up to 25 per cent fluorapatite. A phosphorite sample with 8 per cent fluorapatite assayed 0.022 per cent uranium (Geological Survey of Canada, Paper 79-1A).