Abstract

Upper Silurian and Lower Devonian graptolite biostratigraphy of the northern Canadian Cordillera is revised in the light of new data. The zones, listed in order of oldest to youngest, are Lobograptus progenitor, Saetograptus fritschi linearis, and Bohemograptus bohemicus tenuis: Ludlow; Monograptus formosus, Pristiograptus ultimus, Pristiograptus chelmiensis, Monograptus bouceki, and Pristiograptus transgrediens praecipuus: Pridoli; Monograptus uniformis and M. hercynicus: Lochkov; and Monograptus falcarius?, M. fanicus, M. thomasi?, and M. yukonensis: Prag.The following taxa, inclusive of new species, are described: Pristiograptus separabilis Teller, Pseudomonoclimacis tetlitensis n. sp., P. richardsonensis n. sp., P.? bispinosus n. sp., Monograptus ceratus n. sp., M. aequabilis bardoensis Porebska, M. cf. anerosus Koren', M. fanicus Koren', M. hercynicus hercynicus Perner, M. uniformis parangustidens Jackson and Lenz, Saetograptus fritschi linearis (Bouček), and Abiesgraptus? sp.

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