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Silurian Trilobites from the Northern Yukon Territory

Rolf LudvigsenRonald Pearson TrippRoyal Ontario Museum

出版	Royal Ontario Museum, 1990
主題	Science / Paleontology
ISBN	08885434929780888543493
URL	http://books.google.com.hk/books?id=fo4iAQAAIAAJ&hl=&source=gbs_api

註釋

Silurian trilobites are described from two contrasting facies in the northern Yukon Territory: basinal sediments of the Road River Formation at Prongs Creek and shallow-water limestones of the Illtyd Range. An Otarion Association from dark grey, argillaceous lime mudstones (Lower Silurian) consists of Kosovopeltis, Otarion (Songkania), Cromus, and Leonaspis. These trilobites are identical to those described by Pousen (1934) from his Cape Schuchert Formation of North Greenland. A Stenopareia Association from off-white biosparites (Lower Silurian) includes Stenopareia, a bumastine, Kosovopeltis, and Scotoharpes. A Hedstroemia Association occurs in an Upper Silurian debris flow. It includes Hedstoemia, Prantlia, Balizoma, and Paracybantyx. An incomplete ontogeny of Kosovopeltis borealis (Poulsen) comprises a protaspis and four different transitory pygidia. The bumastine genus Paracybantyx is new. New species are Paracybantyx asulcatus, Stenopareia illtyd, Hedstroemia kutchini, H. sourdoughi, and Prantlia vagrans.