Sixteen species of graptolites of Tremadoc age are described from a continuous succession of the Road River Formation in the Upper Canyon on Peel River. New species described are Kiaerograptus(?) peelensis n. sp., Didymograptus(?) stelcki n. sp., and Staurograptus tenuis n. sp. At this locality the Tremadoc is 136 m thick and contains two zones which have been divided into four subzones as follows: Adelograptus Zone; Adelograptus antiquus Subzone, Clonograptus aureus Subzone: Staurograptus Zone; Anisograptus richardsoni Subzone, Staurograptus tenuis Subzone.