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The Ordovician Tøyen Shale (Floian) and its graptolite fauna at Kinnekulle, Västergötland, Sweden–a regional overview

Maletz, Jörg LU ; Lindskog, Anders LU ; Calner, Mikael LU orcid and Wallin, Åsa LU (2023) In GFF
Abstract

The graptolites of the Tøyen Shale Formation of Kinnekulle in Västergötland, south-central Sweden, are described for the first time and their biostratigraphic distribution is documented from drill core and outcrop material. The faunas indicate an age of mid to late Floian (Billingenian), thus showing a reduced biostratigraphic range of the Tøyen Shale as compared to other areas where this rock unit occurs. A considerable stratigraphic gap is apparent at its base, from the late Tremadocian to mid-Floian, as the limestones of the Ceratopyge acicularis trilobite Zone (late Tremadocian Bjørkåsholmen Formation) are followed by shales with a fauna of the Baltograptus jacksoni graptolite Biozone. Unverified records suggest that mid–late... (More)

The graptolites of the Tøyen Shale Formation of Kinnekulle in Västergötland, south-central Sweden, are described for the first time and their biostratigraphic distribution is documented from drill core and outcrop material. The faunas indicate an age of mid to late Floian (Billingenian), thus showing a reduced biostratigraphic range of the Tøyen Shale as compared to other areas where this rock unit occurs. A considerable stratigraphic gap is apparent at its base, from the late Tremadocian to mid-Floian, as the limestones of the Ceratopyge acicularis trilobite Zone (late Tremadocian Bjørkåsholmen Formation) are followed by shales with a fauna of the Baltograptus jacksoni graptolite Biozone. Unverified records suggest that mid–late Ottenbyan (Hunnebergian) strata (Megistaspis planilimbata trilobite Zone s.l.) locally may be present in the uppermost Bjørkåsholmen Formation as identified herein. There is no indication that the Tøyen Shale reaches into the Dapingian, as Dapingian graptolites have not been recognized. The overlying limestones of the “Lanna Limestone” belong to the Megistaspis polyphemus trilobite Zone and the Baltoniodus triangularis conodont Zone, suggesting a gradual contact of the lithological units.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
in press
subject
keywords
biostratigraphy, graptolites, Kinnekulle, Kinnekulle-1 drillcore, Ordovician, Sweden, Västergötland
in
GFF
publisher
Taylor & Francis
external identifiers
  • scopus:85180679829
ISSN
1103-5897
DOI
10.1080/11035897.2023.2285452
language
English
LU publication?
yes
id
2b5415e5-e8ba-4af1-95c1-796e813c313b
date added to LUP
2024-02-07 15:35:21
date last changed
2024-02-07 15:36:09
@article{2b5415e5-e8ba-4af1-95c1-796e813c313b,
  abstract     = {{<p>The graptolites of the Tøyen Shale Formation of Kinnekulle in Västergötland, south-central Sweden, are described for the first time and their biostratigraphic distribution is documented from drill core and outcrop material. The faunas indicate an age of mid to late Floian (Billingenian), thus showing a reduced biostratigraphic range of the Tøyen Shale as compared to other areas where this rock unit occurs. A considerable stratigraphic gap is apparent at its base, from the late Tremadocian to mid-Floian, as the limestones of the Ceratopyge acicularis trilobite Zone (late Tremadocian Bjørkåsholmen Formation) are followed by shales with a fauna of the Baltograptus jacksoni graptolite Biozone. Unverified records suggest that mid–late Ottenbyan (Hunnebergian) strata (Megistaspis planilimbata trilobite Zone s.l.) locally may be present in the uppermost Bjørkåsholmen Formation as identified herein. There is no indication that the Tøyen Shale reaches into the Dapingian, as Dapingian graptolites have not been recognized. The overlying limestones of the “Lanna Limestone” belong to the Megistaspis polyphemus trilobite Zone and the Baltoniodus triangularis conodont Zone, suggesting a gradual contact of the lithological units.</p>}},
  author       = {{Maletz, Jörg and Lindskog, Anders and Calner, Mikael and Wallin, Åsa}},
  issn         = {{1103-5897}},
  keywords     = {{biostratigraphy; graptolites; Kinnekulle; Kinnekulle-1 drillcore; Ordovician; Sweden; Västergötland}},
  language     = {{eng}},
  publisher    = {{Taylor & Francis}},
  series       = {{GFF}},
  title        = {{The Ordovician Tøyen Shale (Floian) and its graptolite fauna at Kinnekulle, Västergötland, Sweden–a regional overview}},
  url          = {{http://dx.doi.org/10.1080/11035897.2023.2285452}},
  doi          = {{10.1080/11035897.2023.2285452}},
  year         = {{2023}},
}