Stratigraphy of the Upper Jurassic to lowermost Cretaceous in the Rødryggen-1 and Brorson Halvø-1 boreholes, Wollaston Forland, North-East Greenland

Two shallow cores drilled in northern Wollaston Forland, North-East Greenland, provide a combined section covering the upper Kimmeridgian (Upper Jurassic) – Barremian (Lower Cretaceous) and comprising the Bernbjerg, Lindemans Bugt, Palnatokes Bjerg and Stratumbjerg Formations. A new lithostratigraph...

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Bibliographic Details
Published in:GEUS Bulletin
Main Authors: Alsen, Peter, Piasecki, Stefan, Nøhr-Hansen, Henrik, Pauly, Sebastian, Sheldon, Emma, Hovikoski, Jussi
Format: Article in Journal/Newspaper
Language:English
Published: 2023
Subjects:
ammonite stratigraphy
calcareous nannofossil stratigraphy
Jurassic–Cretaceous boundary
palynostratigraphy
Storsletten Member
East Greenland
Greenland
Wollaston forland
Online Access:https://curis.ku.dk/portal/da/publications/stratigraphy-of-the-upper-jurassic-to-lowermost-cretaceous-in-the-roedryggen1-and-brorson-halvoe1-boreholes-wollaston-forland-northeast-greenland(95688c4d-0f1f-4ede-998d-b679e0c71343).html
https://doi.org/10.34194/geusb.v55.8342
https://curis.ku.dk/ws/files/379033584/GEUSB_A_8342_O.pdf
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Summary:Two shallow cores drilled in northern Wollaston Forland, North-East Greenland, provide a combined section covering the upper Kimmeridgian (Upper Jurassic) – Barremian (Lower Cretaceous) and comprising the Bernbjerg, Lindemans Bugt, Palnatokes Bjerg and Stratumbjerg Formations. A new lithostratigraphic unit, the Storsletten Member, is defined within the Lindemans Bugt For-mation. The black mudstone-dominated intervals are dated primarily by dinoflagellate cysts and ammonites, whereas the calcareous mudstones of the Palnatokes Bjerg Formation – sandwiched between the black mudstones – are dated by calcareous nannofossils. The stratigraphy demon-strates an almost complete succession in the Rødryggen-1 core, representing a deeper position in the basin, where the hiatus at the latest Jurassic rift climax predicted in previous models for the eastern Wollaston Forland Basin is absent. In contrast, the Brorson Halvø-1 core represents a position closer to a block crest where unconformities developed. In combination, the cores provide a key biostratigraphic reference section for the Jurassic–Cretaceous boundary interval in the Arctic.

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