The graptolites recovered from the Carnedd Iago Formation of Arenig Fawr, Gwynedd, North Wales are described. They originate from the type section of the Arenig Series and comprise the species Didymograptus aff. simulans Elles & Wood, D. aff. deflexus Elles & Wood, D. cf. praenuntius Törnquist, Azygograptus cf. eivionicus Elles and Tetragraptus reclinatus Elles & Wood.
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Jan Zalasiewicz (1986) studied this question.
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