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Stratigraphically significant Early and Middle Ordovician gastropod occurrences, western and northwestern Canada

Published online by Cambridge University Press:  14 July 2015

David M. Rohr
Affiliation:
Department of Geology, Sul Ross State University, Alpine, Texas 79832
B. S. Norford
Affiliation:
Geological Survey of Canada, Calgary, Alberta T2L 2A7
Ellis L. Yochelson
Affiliation:
Department of Paleobiology, National Museum of Natural History, Washington, D.C. 20560

Abstract

Several biostratigraphically important gastropod genera are described from Alberta, British Columbia, Yukon Territory, and the District of Mackenzie. Malayaspira is present in the mid-Ibexian Kechika Group. Palliseria, Maclurites, Teiichispira, Malayaspira, Barnesella, and Ceratopea occur in the Skoki Formation (highest Ibexian and lower Whiterockian) and Helicotoma and Palliseria in the Sunblood Formation (lower Whiterockian). The largest known Teiichispira operculum is illustrated. The forms are particularly useful for age determination within relatively narrow limits and most of the taxa are readily identified in the field.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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