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U-Pb zircon ages of volcanic ashes integrated with ammonite biostratigraphy, Fernie Formation (Jurassic), western Canada, with
implications for Cordilleran-Foreland Basin connections and comments on the Jurassic time scale; Pana, D I; Poulton, T P;
Heaman, L M. Bulletin of Canadian Petroleum Geology vol. 66, no. 3, 2018 p. 595-622 (ESS Cont.# 20160212)