Lower Permian aged limestone outcrops 5.6 kilometres along a northwest trending ridge just east of Mt. Attree, 19 kilometres southwest of Terrace. The bed is conformably overlain by greenstone, tuff, shale and argillaceous limestone to the north. To the south it is thrust faulted over basaltic to rhyolitic flows, tuff and breccia of the Upper Triassic to Lower Jurassic aged Telkwa Formation. Bedding dips 45 to 67 degrees northeast to southeast.