Ireton microfossil zones of Central and Northeastern Alberta. Western Canada Sedimentary Basin., Clark, L. M., Western Canada Sedimentary Basin. American Association of Petroleum Geologists : Tulsa, 1954 (n. i. 1957) : 182-203 2 pls. figs.", 1960: 182-203. Chapter pagination: 182-203. 193 [Zoological Record Volume 97]