Useful Blairmore microfossil zone in Central and Southern Alberta, Canada. Western Canada Sedimentary Basin., Clark, L. M., Western Canada Sedimentary Basin. American Association of Petroleum Geologists : Tulsa, 1954 n.i. 1957) : 279-296 3 pls. 3 figs.", 1960: 279-296. Chapter pagination: 279-296. 286 [Zoological Record Volume 97]