Middle Cambrian carbonate units within the hangingwall of the Simpson Pass thrust exposed along the western shore of Emerald Lake. Cliff-forming units of the Cambrian Waterfowl, Arctomys, Pika, and
Eldon (lowest cliff former) Formations are visible at Emerald Peak (snow-covered peak in background). The Stephen Formation shale is present in the recessive slopes immediately below the cliffs of the Eldon Formation. The Burgess Shale quarry, within the shales of the Stephen Formation, is located to the right of the photo near Mount Field. Credit: Bryon Veilleux.