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Actinocamax cobbani n. sp. from the Coniacian of Montana and Wyoming and the occurrence of Late Cretaceous belemnites in North America and Greenland

Published online by Cambridge University Press:  20 May 2016

Walter Kegel Christensen
Walter Kegel Christensen*
Affiliation:
Geological Museum, Oster Voldgade 5-7, DK-1350 Copenhagen, Denmark
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Abstract

Actinocamax cobbani, a new belemnitellid species from the middle Coniacian of Montana and Wyoming, is described, including univariate and bivariate biometric analyses. The species is stout and medium sized, lanceolate or strongly lanceolate in ventral view, and has adorally a low cone-shaped alveolar fracture. It may be granulated. It is compared to species of Actinocamax Miller and Gonioteuthis Bayle from the North American and North European paleobiogeographic provinces. The importance of various morphological characters, such as the shape of the guard and the structure of the adoral end, are discussed. The majority of the belemnitellids of the North American Province are endemic and the stratigraphic distribution is punctuated during the Late Cretaceous, suggesting short-lived migrations of populations from the North European Province.

Type
Research Article
Information
Journal of Paleontology , Volume 67 , Issue 3 , May 1993 , pp. 434 - 446
Copyright
Copyright © The Paleontological Society 

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