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Dinocyst stratigraphy of the Valanginian–Aptian Rurikfjellet and Helvetiafjellet formations on Spitsbergen, Arctic Norway

Published online by Cambridge University Press:  11 February 2020

Kasia K. Śliwińska*
Affiliation:
Department of Stratigraphy, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Mads E. Jelby
Affiliation:
Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Sten-Andreas Grundvåg
Affiliation:
Department of Geosciences, UiT The Arctic University of Norway, P.O. Box 6050, Langnes, N-9037 Tromsø, Norway
Henrik Nøhr-Hansen
Affiliation:
Department of Stratigraphy, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Peter Alsen
Affiliation:
Department of Stratigraphy, Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Snorre Olaussen
Affiliation:
Department of Arctic Geology, The University Centre in Svalbard (UNIS), P.O. Box 156, N-9171 Longyearbyen, Norway
*
Author for correspondence: Kasia K. Śliwińska, Email: kksl@geus.dk

Abstract

In order to improve the understanding of how the high northern latitudes responded to the escalating warming which led to the middle Cretaceous super greenhouse climate, more temperature proxy records from the High Arctic are needed. One of the current obstacles in obtaining such records is poor age control on the Lower Cretaceous strata in the Boreal region. Here, we provide a biostratigraphic framework for the Rurikfjellet and Helvetiafjellet formations representing the lower part of the Lower Cretaceous succession on Spitsbergen. We also attempt to date the boundary between the Agardhfjellet and the Rurikfjellet formations. This study is based on dinoflagellate cysts (dinocysts) from three onshore cores (DH1, DH2 and DH5R) and three outcrop sections (Bohemanflya, Myklegardfjellet and Ullaberget). Relatively abundant and well-preserved dinocyst assemblages from the Rurikfjellet Formation date this unit as early Valanginian – early Barremian. The dinocyst assemblages from the Helvetiafjellet Formation are significantly impoverished and are characterized by reworking, but collectively indicate a Barremian–Aptian age for this formation.

Information

Type
Original Article
Copyright
© Cambridge University Press 2020

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