TY - JOUR
T1 - A late campanian euselachian assemblage from the bearpaw formation of Alberta, Canada
T2 - Some notable range extensions
AU - Cook, Todd D.
AU - Brown, Eric
AU - Ralrick, Patricia E.
AU - Konishi, Takuya
N1 - Funding Information:
Collection of the studied euselachian specimens was made possible thanks to the generous permission granted by the Hodgsons to gain access to their ranch. The authors extend their gratitude to Jerry Magraw (Penn State Behrend) for assistance with scanning electron microscope imaging and to M. Templin for French translation of key references. T.K. also thanks D. Tanke, R. Russell, and M. Schilling (Royal Tyrrell Museum of Palaeontology) for their field assistance that resulted in the discovery and recovery of the studied material. Comments by Jürgen Kriwet (University of Vienna), an anonymous reviewer, Anne de Vernal (Associate Editor), and Ali Polat (Editor) greatly improved the manuscript. This project was supported by Penn State Behrend 2015 Undergraduate Student Research Fellowship to E.B. and by Government of Alberta Japanese–Canadian Initiative Postdoctoral Fellowship to T.K.
Publisher Copyright:
© 2017, Canadian Science Publishing. All rights reserved.
PY - 2017
Y1 - 2017
N2 - Herein, we report an euselachian assemblage from the late Campanian Bearpaw Formation recovered from southern Alberta, Canada. This small yet uniquely diverse fauna includes the northernmost occurrences of Paraorthacodus andersoni, Squalus worlandensis, Odontaspis aculeatus, and Archaeotriakis ornatus within the Western Interior Seaway. It also constitutes the first record of P. andersoni, S. worlandensis, and A. ornatus from Canadian deposits. Moreover, we report the stratigraphically youngest record of Cretoxyrhina mantelli. This assemblage is unique in that all the identifiable euselachian species are either pelagic or benthopelagic but not benthic. This is in stark contrast to the batoid-rich euselachian assemblage of the Lethbridge Coal Zone that immediately underlies the Bearpaw Formation in southern Alberta. We attribute this difference to dysoxic bottom waters during the deposition of the formation, rather than to sampling bias.
AB - Herein, we report an euselachian assemblage from the late Campanian Bearpaw Formation recovered from southern Alberta, Canada. This small yet uniquely diverse fauna includes the northernmost occurrences of Paraorthacodus andersoni, Squalus worlandensis, Odontaspis aculeatus, and Archaeotriakis ornatus within the Western Interior Seaway. It also constitutes the first record of P. andersoni, S. worlandensis, and A. ornatus from Canadian deposits. Moreover, we report the stratigraphically youngest record of Cretoxyrhina mantelli. This assemblage is unique in that all the identifiable euselachian species are either pelagic or benthopelagic but not benthic. This is in stark contrast to the batoid-rich euselachian assemblage of the Lethbridge Coal Zone that immediately underlies the Bearpaw Formation in southern Alberta. We attribute this difference to dysoxic bottom waters during the deposition of the formation, rather than to sampling bias.
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U2 - 10.1139/cjes-2016-0233
DO - 10.1139/cjes-2016-0233
M3 - Article
AN - SCOPUS:85030755723
SN - 0008-4077
VL - 54
SP - 973
EP - 980
JO - Canadian Journal of Earth Sciences
JF - Canadian Journal of Earth Sciences
IS - 9
ER -