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Tortodus dodoensis, a new conodont species, and a Givetian (Middle Devonian) conodont fauna from the northern Mackenzie Mountains, northwest Canada

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Abstract

A new conodont species Tortodus dodoensis sp. nov. from the lower part of the Givetian (Middle Devonian) of the Mackenzie Mountains (NW Canada) is described. This paper also reports the lowest stratigraphic occurrence of a Givetian fauna containing a.o. Polygnathus amphora, P. denisbriceae, P. xylus ensensis, P. pseudoeiflius, P. linguiformis klapperi s.l., P. l. weddigei, P. parawebbi and P. pseudofoliatus from the northern Mackenzie Mountains. This fauna situates the sample in the timorensis to ansatus zones interval, possibly restricting it to the timorensis Zone. This result allows the positioning of the Eifelian–Givetian contact within the lowest 7.5 m of the Hare Indian Formation (Horn River Group) (northern Mackenzie Mountains, NW Territories).

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Acknowledgements

The authors wish to thank P. Kabanov (GSC Calgary) for his advice on the local stratigraphy. Thanks also to the Northwest Territories Geological Survey (NTGS) for allowing the authors to study the Dodo Canyon sample. The sample was processed in the GSC Calgary conodont laboratory by technician Denise Then. SEM imaging was done at the Microscopy and Imaging Facility (IMF) of the University of Calgary. We thank Jau-Chyn Liao (University of Valencia, Spain), Editor-in-Chief Mike Reich and in particular, an anonymous reviewer for the kindly provided constructive advice that helped improving the manuscript. This paper is Geological Survey of Canada contribution no. 20180120 and a contribution to the IGCP 652 project “Reading geological time in Paleozoic sedimentary rocks”.

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  1. Geological Survey of Canada (Calgary Office), 3303, 33rd St. NW, Calgary, AB, T2L 2A7, Canada

    Sofie A. Gouwy, Thomas T. Uyeno & Alexander D. McCracken

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  1. Sofie A. Gouwy
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Gouwy, S.A., Uyeno, T.T. & McCracken, A.D. Tortodus dodoensis, a new conodont species, and a Givetian (Middle Devonian) conodont fauna from the northern Mackenzie Mountains, northwest Canada. PalZ 94, 327–342 (2020). https://doi.org/10.1007/s12542-019-00462-1

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