Abstract
The highly condensed Lower to Middle Ordovician deep-water succession from the Cap-des-Rosiers Group at Matane bears three conspicuous graptolite faunas of late Tremadoc to mid-Darriwilian age. The Tremadoc fauna belongs to the Aorograptus victoriae Zone. In the Castlemainian Isograptus victoriae maximodivergens Zone fauna the earliest Pseudisograptus species, Pseudisograptus initialis n. sp., appears together with the ancestral Arienigraptus gracilis. A Darriwilian fauna with Holmograptus spinosus and Bergstroemograptus crawfordi represents the youngest pre-Nemagraptus gracilis Zone fauna described from the Quebec Appalachians.
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