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A palynological study from Sweden reveals stable terrestrial environments during Late Silurian extreme marine conditions
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-2987-5559
2015 (English)In: Earth and environmental science transactions of the Royal Society of Edinburgh, ISSN 1755-6910, E-ISSN 1755-6929, Vol. 105, 149-158 p.Article in journal (Refereed) Published
Abstract [en]

A palynological study of the upper Silurian Öved–Ramsåsa Group in Skåne, Sweden yields a well preserved spore assemblage with low relative abundances of marine microfossils. In total, 26 spore taxa represented by 15 genera were identified. The spore assemblage is dominated by long-ranging cryptospore taxa, and the trilete spore Ambitisporites avitus-dilutus. However, key-species identified include Artemopyra radiata, Hispanaediscus lamontii, H. major, H. verrucatus, Scylaspora scripta and Synorisporites cf. libycus. Importantly, Scylaspora klintaensis was identified, allowing correlation with the Klinta 1 drillcore (Skåne). A Ludlow age is inferred for the exposed succession, which agrees well with previous conodont stratigraphy. The organic residue is dominated by phytodebris and spores, but with high relative abundances of acritarchs at two levels, possibly related to flooding surfaces. Based on the palynofacies analysis, a near-shore marine environment is proposed. The close proximity to land is inferred by the high proportions of spores, and the dispersed assemblage most likely represents the local flora growing on delta plains. The palynological signal also infers a stable terrestrial environment and vegetation, in contrast to unstable conditions in the marine environment characterised by ooid formation in an evaporitic environment. Comparisons with coeval spore assemblages from Gotland, Avalonia and Laurentia show relatively close similarities in taxonomic composition at the generic level.

Place, publisher, year, edition, pages
The Royal Society of Edinburgh , 2015. Vol. 105, 149-158 p.
Keyword [en]
Silurian, spores, early land plants, evolution
Keyword [sv]
Silur, sporer, tidiga landväxter, evolution
National Category
Research subject
The changing Earth
URN: urn:nbn:se:nrm:diva-1416DOI: 10.1017/S1755691015000043OAI: diva2:873002
Available from: 2015-11-21 Created: 2015-11-21 Last updated: 2015-11-23Bibliographically approved

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Vajda, Vivi
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