The biostratigraphic and depth-related ecostratigraphic significance of a newly discovered graptolite–phyllocarid faunule containing diminutive Rhabdinopora enigma and Anisograptus compactus of early to middle Tremadoc age from the Cooks Brook Formation (Humber Arm Supergroup) is described and discussed. The faunule is identical with the La1 (Lancefieldian) graptolite–phyllocarid-bearing black shale "band" of Victoria, Australia, which was until now only known from two or three outcrops in Victoria and a single bed in northern Norway. This graptolite faunule probably represents a very distal shelf-marginal or open-ocean correlative of the Cap des Rosiers (Quebec) and Green Point (Cow Head Group, Newfoundland) late early Tremadoc anisograptid graptolite biofacies realm.

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