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Exotic trilobites from the uppermost Cambrian Series 3 and lower Furongian of Sweden

Author:
  • Anna Zylinska
  • Thomas Weidner
  • John Ahlgren
  • Per Ahlberg
Publishing year: 2015
Language: English
Pages: 21-67
Publication/Series: Acta Geologica Polonica
Volume: 65
Issue: 1
Document type: Journal article
Publisher: Polska Akad Nauk, Polish Acad Sciences, Univ Warsaw, Geology Dept

Abstract english

Seventeen taxa of exotic trilobites representing eight families are described from the olenid- and agnostoid-dominated strata of the uppermost Cambrian Series 3 and lower Furongian alum shale facies of Sweden and from glacial erratic boulders of Denmark. Only the taxa are assigned to species level, i.e., Maladioidella abdita (Salter, 1866), Olentella rara (Westergard, 1922), Pedinocphalus peregrinus (Henningsmoen, 1957), Ptychoparia pusilla (Westergard. 1922), and Westergaardella olenorum (Westergard, 1922), whereas the others are left under open nomenclature or remain unrecognized. Most are described for the first time from the Cambrian of Scandinavia. Their affinities point to a strong connection with East Gondwana, Laurentia, Kazakhstania and Siberia. Exotic trilobites appear in the succession directly after periods of very low oxygen concentration in the Alum Shale Sea; their occurrences correspond to the ranges of agnostoid arthropods in the succession and seem to be linked to global transgressive events causing an influx of cool mid or oxygen depleted waters onto the shelf of the Baltica palaeocontinent

Keywords

  • Geology
  • Trilobita
  • Cambrian Series 3
  • Furongian
  • Alum Shale
  • Glacial erratic
  • boulders
  • Sweden
  • Denmark
  • Scandinavia
  • Exotic trilobites

Other

Published
  • ISSN: 0001-5709
Per Ahlberg
E-mail: per [dot] ahlberg [at] geol [dot] lu [dot] se

Professor

Lithosphere and Biosphere Science

+46 46 222 78 70

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