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Published August 2009 | public
Journal Article

Molluscan biostratigraphy and paleomagnetism of Campanian strata, Queen Charlotte Islands, British Columbia: implications for Pacific coast North America biochronology


A previously uncollected fauna of ammonites, bivalves, and other molluscs, associated with radiolarian microfossils, has been newly recognized near Lawn Hill on the east coast of central Queen Charlotte Islands, British Columbia. The regional biostratigraphic zonation indicates that the Lawn Hill fauna is correlative with the Nostoceras hornbyense zonule of the Pachydiscus suciaensis ammonite biozone, recognized in the Nanaimo Group of southeast Vancouver Island. The Nostoceras hornbyense Zone (new) is herein proposed for strata of Pacific coast Canada containing the zonal index. Several molluscan taxa present in the Lawn Hill section are new to British Columbia and the ammonite fauna suggests that the Nostoceras hornbyense Zone is late Campanian in age, supported by radiolarian taxa present in the section. Strata sampled in the Lawn Hill section preserve reversed-polarity magnetization, considered likely correlative with Chron 32r. The presence of the Nostoceras hornbyense Zone on Queen Charlotte Islands is the first recognition of this zone in Canada north of central Vancouver Island and represents the youngest Cretaceous known in this region. Campanian radiolarians identified from the Lawn Hill section are also the first recognized from the Pacific coast of Canada.

Additional Information

Crown Copyright © 2009. Published by Elsevier. Received 9 June 2008; accepted 13 February 2009. Available online 3 March 2009. Fieldwork in 1998 and 1999 was supported by NSF Grant EAR-9432487 to PW and JK and by Geological Survey of Canada project 880038 (JWH). An earlier version of this manuscript benefited from comments by Randy Enkin and Ken Kodama. We thank Cory Brimblecombe and Rod Bartlett for fossil preparation, Peter Krauss for photography, and Hillary Taylor for technical assistance. The manuscript benefited significantly from the reviews of two anonymous reviewers. Geological Survey of Canada contribution 20080419.

Additional details

August 21, 2023
October 19, 2023