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Acritarchs from the Duolbagáisá Formation (Cambrian Series 2, Miaolingian) on the Digermulen Peninsula, Finnmark, Arctic Norway: towards a high-resolution Cambrian chronostratigraphy

  • Teodoro Palacios (a1), Anette E. S. Högström (a2), Jan Ove R. Ebbestad (a3), Heda Agić (a4) (a5), Magne Høyberget (a6), Sören Jensen (a1), Guido Meinhold (a7) (a8) and Wendy L. Taylor (a9)...

Abstract

New information on acritarchs from the Duolbagáisá Formation, Digermulen Peninsula, Arctic Norway, enable recognition of the three Cambrian Series 2 acritarch-based zones: the Skiagia ornataFimbriaglomerella membranacea, Heliosphaeridium dissimilareSkiagia ciliosa and Volkovia dentiferaLiepaina plana Assemblage zones. Acritarchs of the Skiagia ornataFimbriaglomerella membranacea Zone (Cambrian Stage 3) appear near the base of the unit, close to an undetermined trilobite. In the Upper Member of the Duolbagáisá Formation, in levels with Kjerulfia n. sp. and Elliptocephala n. sp., appears an assemblage with abundant Skiagia ciliosa, indicative of the Heliosphaeridium dissimilareSkiagia ciliosa Zone. A few metres higher appear Liepaina plana, Heliosphaeridium notatum and Retisphaeridium dichamerum, which indicate the Volkovia dentiferaLiepaina plana Zone (Cambrian Stage 4). The transition between the Duolbagáisá Formation and the overlying Kistedalen Formation is marked by the appearance of Comasphaeridium longispinosum, Multiplicisphaeridium llynense and Eliasum llaniscum, diagnostic of the Miaolingian Series. This coincides with the disappearance of Skiagia; occurrences of Skiagia in Miaolingian strata consist of reworked material related to the Hawke Bay regression at the Cambrian Stage 4–Wuliuan transition. The absence of Skiagia in higher levels of the Duolbagáisá Formation and Kistedalen Formation suggests that no unconformity formed during the Hawke Bay regression in this area. The chronostratigraphical significance of the Skiagia ornataFimbriaglomerella membranacea, Heliosphaeridium dissimilareSkiagia ciliosa and Volkovia dentiferaLiepaina plana zones is critically analysed. Correlation of the Duolbagáisá Formation with peri-Gondwanan terrains of Avalonia and Iberia is established. The Digermulen Peninsula has great potential as a reference section for establishing a Cambrian chronostratigraphy based on acritarchs.

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Corresponding author

Author for correspondence: Teodoro Palacios, Email: medrano@unex.es

References

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Keywords

Acritarchs from the Duolbagáisá Formation (Cambrian Series 2, Miaolingian) on the Digermulen Peninsula, Finnmark, Arctic Norway: towards a high-resolution Cambrian chronostratigraphy

  • Teodoro Palacios (a1), Anette E. S. Högström (a2), Jan Ove R. Ebbestad (a3), Heda Agić (a4) (a5), Magne Høyberget (a6), Sören Jensen (a1), Guido Meinhold (a7) (a8) and Wendy L. Taylor (a9)...

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