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Middle Albian (Lower Cretaceous) Gastroplitinid ammonites and dinoflagellates from the Christopher Formation (Dragon Mountain, Axel Heiberg Island, Canadian Arctic Islands) and a revision of the genus Pseudogastroplites Jeletzky, 1980

Published online by Cambridge University Press:  20 May 2016

Russell L. Hall ,
R. Andrew Macrae  and
L. V. Hills
Russell L. Hall
Affiliation:
Department of Geology and Geophysics, University of Calgary, Alberta T2N 1N4, Canada,
R. Andrew Macrae
Affiliation:
Department of Geology, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada,
L. V. Hills
Affiliation:
Department of Geology and Geophysics, University of Calgary, Alberta T2N 1N4, Canada,
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Abstract

A large sample of excellently preserved ammonites from concretions concentrated at a single horizon near the base of the Macdougall Point Member of the Christopher Formation (Aptian–Albian age; Early Cretaceous) is the basis for recognizing a new species of the boreal ammonite genus Pseudogastroplites (P. draconensis). The dimorphic nature of the genus is established, two variants are recognized (P. draconensis var. robusta and P. draconensis var. gracile), and the generic diagnosis is emended. Retention of the genus Pseudogastroplites Jeletzky, 1980 as distinct from Gastroplites McLearn, 1930 is proposed. The concretions also yield Pseudopulchellia flexicostata (Imlay, 1961), inoceramid bivalves, fish remains, and a palynological flora, and are dated as late middle Albian.

Type
Research Article
Information
Journal of Paleontology , Volume 79 , Issue 2 , March 2005 , pp. 219 - 241
Copyright
Copyright © The Paleontological Society 

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