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Per Ahlberg

Per Ahlberg

Professor emeritus

Per Ahlberg

Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China

Author

  • Jan Bergstrom
  • Zhou Zhiqiang
  • Per Ahlberg
  • Niklas Axheimer

Summary, in English

Upper lower Cambrian (provisional Cambrian Series 2) trilobites are described from three sections through the Shuangyingshan Formation in the Beishan area, northwestern Gansu Province, China. The trilobite fauna is dominated by eodiscoid and 'corynexochid' trilobites, together representing at least ten genera: Serrodiscus, Tannudiscus, Calodiscus, Pagetides, Kootenia, Edelsteinaspis, Ptarmiganoides?, Politinella, Dinesus and Subeia. Eleven species are described, of which seven are identified with previously described taxa and four described under open nomenclature. The composition of the fauna suggests biogeographic affinity with Siberian rather than Gondwanan trilobite faunas, and the Cambrian Series 2 faunas described herein and from elsewhere in northwestern China seem to be indicative of the marginal areas of the Siberian palaeocontinent. This suggests that the Middle Tianshan-Beishan Terrane may have been located fairly close to Siberia during middle-late Cambrian Epoch 2.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2014

Language

English

Pages

123-143

Publication/Series

Estonian Journal of Earth Sciences

Volume

63

Issue

3

Document type

Journal article

Publisher

Estonian Academy Publishers

Topic

  • Geology

Keywords

  • Trilobita
  • taxonomy
  • palaeobiogeography
  • lower Cambrian
  • Cambrian Series
  • 2
  • Beishan
  • Gansu Province
  • China

Status

Published

ISBN/ISSN/Other

  • ISSN: 1736-7557