A body of massive grey limestone with minor conglomerate and shale of Upper Triassic age extends southeastward from Hanceville along the south side of the Chicoltin River for 16 kilometres with widths of up to 5.5 kilometres. The limestone is covered by Miocene to Pliocene plateau basalts to the southeast and bounded by Upper Triassic argillite, greywacke and andesitic to basaltic volcanics to the northwest. Bedding generally dips 20 to 70 degrees southwest to northeast.

The age of the limestone, Upper Triassic, and its distance from Upper Triassic strata of Quesnellia to the east, suggests that it is part of the Cadwallader Terrane.