The Ordovician and Silurian rocks in the region of the southern Richardson Mountains and adjacent areas in northern Yukon Territory contain an abundant and varied graptolite assemblage. A complete section of rocks, ranging from lowermost Ordovician to uppermost Middle Silurian in age is apparently represented in the area. One hundred species, and one new genus, are described and figured from the two systems. These include two new variations and four new species from the Ordovician, and three new variations and one new species from the Silurian. The Lower Ordovician has by far the most abundant fauna.

Graptolite faunas are readily correlated with zones of the type sections of North America and Great Britain. Correlation and distribution of the graptolites are shown on accompanying tables.

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