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; Fensome, R A; Munstermann, D K; in, Geologic time scale 2020, volume 1
; Gradstein, F M (ed.); Ogg, J
G (ed.); Schmitz, M D (ed.); Ogg, G M (ed.). (ed. 1), 2020 p. 99-108 (NRCan Cont.# 20180332)