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
and Wallin, Åsa
LU
(2023)
In GFF
145(3-4).
p.97-112
- 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.
(Less)
- author
- Maletz, Jörg
LU
; Lindskog, Anders
LU
; Calner, Mikael
LU
and Wallin, Åsa
LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- biostratigraphy, graptolites, Kinnekulle, Kinnekulle-1 drillcore, Ordovician, Sweden, Västergötland
- in
- GFF
- volume
- 145
- issue
- 3-4
- pages
- 97 - 112
- 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
- 2024-12-17 16:05:03
@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}},
number = {{3-4}},
pages = {{97--112}},
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}},
volume = {{145}},
year = {{2023}},
}