HALL, RUSSELL, and SIMONA PITARU. 2004. “NEW HETTANGIAN AMMONITE FAUNAS AND A TRIASSIC - JURASSIC BOUNDARY SUCCESSION, FERNIE FORMATION, WILLISTON LAKE, BRITISH COLUMBIA”. RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA 110 (1). https://doi.org/10.13130/2039-4942/6263.