Upper Homerian (Wenlock, Silurian) graptolites and graptolite biostratigraphy, Arctic Archipelago, Canada

• Published in: Canadian Journal of Earth Sciences
• Main Author: Lenz, Alfred C.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1995
• Subjects: General Earth and Planetary Sciences; Arctic; Canada; Arctic Archipelago
• Online Access: http://dx.doi.org/10.1139/e95-111; http://www.nrcresearchpress.com/doi/pdf/10.1139/e95-111

Integration of graptolite data obtained from isolated and flattened material from Arctic Canada permits the recognition of three upper Homerian biostratigraphic zones. These, from oldest to youngest, are the Pristiograptus dubius – Gothograptus "nassa" interval Biozone, Colonograptus? praedeubeli – Colonograptus? deubeli Biozone, and Colonograptus? ludensis Biozone. Species of flattened graptolites described in this study include C.? deubeli, C.? ludensis, C.? praedeubeli, Colonograptus? schedidoneus,Lobograptus ? angustus n.sp., Lobograptus? claudiae, Lobograptus? sherrardae, Plectograptus macilentus, Agastograptus clathrospinosus, and Gothograptus "nassa." With only a few exceptions, the zone-by-zone diversity of monograptid and plectograptine graptolites of the Canadian Arctic is remarkably similar to that elsewhere.