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Johan Lindgren

Johan Lindgren

Senior lecturer

Johan Lindgren

Late cretaceous sharks Cretoxyrhina and Cardabiodon from Montana, USA

Author

  • Mikael Siverson
  • Johan Lindgren

Summary, in English

The middle part of the Cretaceous represents a time of high diversity and rapid rates of dental evolution in lamniform sharks. Several species had a very wide spatial distribution with recorded occurrences in both hemispheres. We have examined isolated teeth of Cretoxyrhina and Cardabiodon from eastern Russia, Mangyshlak in Kazakhstan, and the Western Interior of the USA. The material indicates that samples of isolated teeth of the two genera have high potential in intercontinental correlation of the upper Albian to mid-Turonian interval in mid-palaeolatitude deposits, poor in other age-diagnostic fossil groups. The utilization of these lamniforms in mid-Cretaceous biostratigraphy is currently hampered by the nearly total absence in the literature of well illustrated, well dated and sufficiently large samples of isolated teeth of the two genera. As a first Step towards the establishment of an intercontinental elasmobranch zonation for mid-Cretaceous strata in temperate palaeo-regions, we describe and illustrate samples of teeth of Cardabiodon venator SP. nov. and Cretoxyrhina mantelli from the lower middle Turonian Collignoniceras woollgari regulare Zone in the Fairport Member of the Carlile Shale in east-central Montana, USA. These samples could serve as reference points for future biostratigraphic studies of Cretoxyrhina and Cardabiodon. The extinction of Cretoxryhina may be diachronous, as regional last appearance data range from the upper Santonian (Marsupites testudinarius Zone) in Western Australia to the uppermost lower Campanian (informal Belemnellocamax maminillatus zone; a lateral equivalent to the German Gonioteuthis quadrata gracilislBelemnitella inucronata Zone) in southern Sweden.

Department/s

  • Department of Geology
  • Lithosphere and Biosphere Science

Publishing year

2005

Language

English

Pages

301-314

Publication/Series

Acta Palaeontologica Polonica

Volume

50

Issue

2

Document type

Journal article

Publisher

Instytut Paleobiologii PAN

Topic

  • Geology

Keywords

  • biostratigraphy
  • sharks
  • Lamniformes
  • Cardabiodon
  • Cretoxyrhina
  • Cretaceous

Status

Published

ISBN/ISSN/Other

  • ISSN: 0567-7920