Article: New data on Tremadoc graptolites from Yukon, Canada
The Tremadocian subzones of Staurograptus tenuis. Anisograptus richardsoni. Clonograptus aureus, and Adelagraptus anriquus are given full zonal status in northern Richardson Mountains. Bryograptus ramosus Broggor and a species of Dictyonema are described from the upper Tremadotc. The occurrence of B. ramosus in the C. aureus Zone supports a correlation with shales of 3a(beta symbol) age in Norway.