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Cambrian stratigraphy of the Tomten-1 drill core, Västergötland, Sweden

  • Per Ahlberg
  • Mats E. Eriksson
  • Frans Lundberg
  • Anders Lindskog
Publishing year: 2016
Language: English
Pages: 490-501
Publication/Series: GFF
Volume: 138
Issue: 4
Document type: Journal article
Publisher: Taylor & Francis

Abstract english

The Tomten-1 drilling at Torbjörntorp in Västergötland, southern Sweden, penetrated 29.85 m of Cambrian Series 2, Cambrian Series 3, Furongian, and Lower–Middle Ordovician strata. Lithostratigraphically, the succession includes the File Haidar, Borgholm and Alum Shale formations, and the Latorp and Lanna limestones. The drill core succession is described herein for the first time, with special focus on the biostratigraphy of the Cambrian Alum Shale Formation. In the Cambrian Series 3, through Furongian Alum Shale Formation, agnostoids and trilobites have been identified to species level and the succession is subdivided into nine biozones (in ascending order): the Ptychagnostus gibbus, Ptychagnostus atavus, Lejopyge laevigata, Agnostus pisiformis, Olenus gibbosus, Parabolina spinulosa, Ctenopyge tumida, Ctenopyge bisulcata and Ctenopyge linnarssoni zones. The succession is interrupted by numerous stratigraphic gaps of variable magnitudes, as is evident from the biostratigraphy and conspicuous unconformities.


  • Geology
  • agnostoids
  • biostratigraphy
  • Cambrian
  • Sweden
  • trilobites
  • Västergötland


  • ISSN: 1103-5897
Per Ahlberg
E-mail: per [dot] ahlberg [at] geol [dot] lu [dot] se


Lithosphere and Biosphere Science

+46 46 222 78 70