The Champion Bay Group is a stratigraphic group in Australia. It was deposited in the Bajocian stage of the Middle Jurassic. The limestones of the group have provided ammonites.
References
Further reading R. L. Hall. 1989. Lower Bajocian ammonites (Middle Jurassic; Soninniidae) from the Newmarracarra Limestone, Western Australia. Alcheringa 13:1-20