A 30-metre thick lens of limestone outcrops along a roadcut on Highway 5 and continues eastward for 300 metres, 1.3 kilometres north-northeast of Rayleigh Station and 17 kilometres north of the community of Kamloops . The limestone is hosted in a sequence of interbedded chert pebble conglomerate and chert arenite with minor augite/hornblende porphyry of the Carboniferous to Triassic Nicola and/or Harper Ranch groups. Bedding strikes 065 degrees and dips 80 degrees northwest. The lens is composed of grey, medium-grained limestone containing nodules and patches of chert and veinlets of calcite.