Stratigraphy of the Ordovician-Silurian boundary interval in Östergötland, Sweden, based on ostracod distribution and stable carbon isotopic data

The Hirnantian glaciation event at the end of the Ordovician brought along major biological and oceanographic changes. The Harpabollia harparum ostracod assemblage characterized by its distinct species composition has been described only from localities where the presence of the Hirnantian strata is...

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Bibliographic Details
Published in:GFF 2012-12, Vol.134 (4), p.295-308
Main Authors: Truuver, Karin, Meidla, Tõnu, Ainsaar, Leho, Bergström, Jan, Tinn, Oive
Format: Article
Language:English
Subjects:
Baltoscandia
Carbon
Hirnantian
Isotopes
ostracods
Råssnäsudden
Stratigraphy
Sweden
Upper Ordovician
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Summary:The Hirnantian glaciation event at the end of the Ordovician brought along major biological and oceanographic changes. The Harpabollia harparum ostracod assemblage characterized by its distinct species composition has been described only from localities where the presence of the Hirnantian strata is proven. This paper focuses on the distribution of this association from the Baltic area to Scandinavia (Sweden) and compares the faunal composition between these two areas. Altogether 4733 ostracods of 69 species were collected from the Ordovician-Silurian boundary interval in the Råssnäsudden section in Östergötland, SE Sweden. Pre-Hirnantian and Llandoverian assemblages are present, but there is no evidence of any H. harparum association or any HICE (Hirnantian carbon isotope excursion) peak in δ 13 C values. This evidence suggests a gap in the Råssnäsudden outcrop that corresponds to most of the Hirnantian.
ISSN:1103-5897
2000-0863
DOI:10.1080/11035897.2012.762550