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Amberg et al., 2017

Amberg, C. E. A., Vandenbroucke, T. R. A., Nielsen, A. T., Munnecke, A., McLaughlin, P. I. 2017. Chitinozoan biostratigraphy and carbon isotope stratigraphy from the Upper Ordovician Skogerholmen Formation in the Oslo Region. A new perspective for the Hirnantian lower boundary in Baltica. Elsevier BV. Review of Palaeobotany and Palynology. Review of Palaeobotany and Palynology 246, 109-119. | DOI | DETAILS

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ID6453
ReferenceAmberg et al., 2017
AuthorAmberg, C. E. A., Vandenbroucke, T. R. A., Nielsen, A. T., Munnecke, A., McLaughlin, P. I.
Year2017
TitleChitinozoan biostratigraphy and carbon isotope stratigraphy from the Upper Ordovician Skogerholmen Formation in the Oslo Region. A new perspective for the Hirnantian lower boundary in Baltica
Published byElsevier BV
JournalReview of Palaeobotany and Palynology
Journal detailsReview of Palaeobotany and Palynology
Volume246
pgs.109-119
Source typearticle in journal
LanguageEnglish
DOI10.1016/j.revpalbo.2017.06.008
Abstract

The end-Ordovician has received wide attention because it hosts major global events including mass extinctions, glaciations, significant sea-level fluctuations, and large-scale perturbations of the Earth's carbon cycle. Knowing the order and timing of these events and their components is crucial for understanding these environmental changes. Here, we use stable carbon isotope stratigraphy in combination with chitinozoan biostratigraphy to correlate the Upper Ordovician Belonechitina gamachiana chitinozoan Biozone. Its position has long been a matter of debate; some argue that it is of late Katian age and others that it is of early Hirnantian age. The Skogerholmen Formation from the Oslo-Asker District in Norway has been correlated with the lower-middle Pirgu Baltic Stage, hitherto believed to correspond to the international upper Katian Stage. Our study, however, reveals the presence of B. gamachiana, diagnostic of the eponymous Biozone, in the descending trend of a modest carbon isotope excursion in the lower part of this formation. This is strikingly similar to data from coeval end-Ordovician sections in North America, where the prevailing evidence suggests an early Hirnantian age for the B. gamachiana chitinozoan Biozone. This new correlation suggests that the lower Hirnantian boundary may be positioned within the Pirgu Baltic Stage.