Advanced

Conodont biostratigraphy, and delta C-13 and delta S-34 isotope chemostratigraphy, of the uppermost Ordovician and Lower Silurian at Osmundsberget, Dalarna, Sweden

Bergstroem, Stig Magnus; Eriksson, Mats LU ; Young, Seth Allen and Widmark, Eva-Marie (2012) In GFF 134(4). p.251-272
Abstract
The previously established graptolite and chitinozoan Hirnanian-Telychian biostratigraphy in the unique Osmundsberget North outcrop in the Siljan region, south-central Sweden, is integrated with new conodont biostratigraphy and C-13(org), C-13(carb) and S-34(pyr) chemostratigraphy. At this locality, the middle Hirnantian (latest Ordovician) topmost part of the Boda Limestone is overlain by the latest Hirnantian Glisstjarn Formation, and the late Aeronianearly Telychian (Llandovery) Kallholn Formation rests unconformably on the Glisstjarn Formation. Previous conodont work showed that the Glisstjarn Formation belongs to the lower Ozarkodina hassi Zone. New samples from calcareous interbeds in the dominantly shaly Kallholn Formation, some of... (More)
The previously established graptolite and chitinozoan Hirnanian-Telychian biostratigraphy in the unique Osmundsberget North outcrop in the Siljan region, south-central Sweden, is integrated with new conodont biostratigraphy and C-13(org), C-13(carb) and S-34(pyr) chemostratigraphy. At this locality, the middle Hirnantian (latest Ordovician) topmost part of the Boda Limestone is overlain by the latest Hirnantian Glisstjarn Formation, and the late Aeronianearly Telychian (Llandovery) Kallholn Formation rests unconformably on the Glisstjarn Formation. Previous conodont work showed that the Glisstjarn Formation belongs to the lower Ozarkodina hassi Zone. New samples from calcareous interbeds in the dominantly shaly Kallholn Formation, some of which contain hundreds of condont elements, yielded Distomodus staurognathoides, Aspelundia fluegeli and other taxa indicating the D.staurognathoides Zone. In the East Baltic succession, the coeval interval, which is in the uppermost Raikkulalowermost Adavere stages just below the geographically widespread Osmundsberg K-bentonite, has yielded a conodont fauna similar to that of the lower Kallholn Formation. A regional review of the D. staurognathoides Zone shows that there are possible equivalents to our study interval also in Norway and the Welsh Borderland, but equivalent strata are missing in large parts of North America, or have not produced diagnostic conodonts. The C-13(org) values from the study section are relatively uniform (mostly ranging between 29 parts per thousand and 30 parts per thousand), and the late Aeronian and Valgu positive excursions have not been recognized. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
conodont biostratigraphy, C-13 and S-34 chemostratigraphy, Llandovery, Hirnantian, Sweden, regional correlation
in
GFF
volume
134
issue
4
pages
251 - 272
publisher
Geological Society of Sweden
external identifiers
  • wos:000317822000003
  • scopus:84876301516
ISSN
2000-0863
DOI
10.1080/11035897.2012.758169
language
English
LU publication?
yes
id
7b51377f-fea4-4b57-9961-1a18fd1a8b83 (old id 3857829)
date added to LUP
2013-06-19 12:23:26
date last changed
2017-09-10 03:26:22
@article{7b51377f-fea4-4b57-9961-1a18fd1a8b83,
  abstract     = {The previously established graptolite and chitinozoan Hirnanian-Telychian biostratigraphy in the unique Osmundsberget North outcrop in the Siljan region, south-central Sweden, is integrated with new conodont biostratigraphy and C-13(org), C-13(carb) and S-34(pyr) chemostratigraphy. At this locality, the middle Hirnantian (latest Ordovician) topmost part of the Boda Limestone is overlain by the latest Hirnantian Glisstjarn Formation, and the late Aeronianearly Telychian (Llandovery) Kallholn Formation rests unconformably on the Glisstjarn Formation. Previous conodont work showed that the Glisstjarn Formation belongs to the lower Ozarkodina hassi Zone. New samples from calcareous interbeds in the dominantly shaly Kallholn Formation, some of which contain hundreds of condont elements, yielded Distomodus staurognathoides, Aspelundia fluegeli and other taxa indicating the D.staurognathoides Zone. In the East Baltic succession, the coeval interval, which is in the uppermost Raikkulalowermost Adavere stages just below the geographically widespread Osmundsberg K-bentonite, has yielded a conodont fauna similar to that of the lower Kallholn Formation. A regional review of the D. staurognathoides Zone shows that there are possible equivalents to our study interval also in Norway and the Welsh Borderland, but equivalent strata are missing in large parts of North America, or have not produced diagnostic conodonts. The C-13(org) values from the study section are relatively uniform (mostly ranging between 29 parts per thousand and 30 parts per thousand), and the late Aeronian and Valgu positive excursions have not been recognized.},
  author       = {Bergstroem, Stig Magnus and Eriksson, Mats and Young, Seth Allen and Widmark, Eva-Marie},
  issn         = {2000-0863},
  keyword      = {conodont biostratigraphy,C-13 and S-34 chemostratigraphy,Llandovery,Hirnantian,Sweden,regional correlation},
  language     = {eng},
  number       = {4},
  pages        = {251--272},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {Conodont biostratigraphy, and delta C-13 and delta S-34 isotope chemostratigraphy, of the uppermost Ordovician and Lower Silurian at Osmundsberget, Dalarna, Sweden},
  url          = {http://dx.doi.org/10.1080/11035897.2012.758169},
  volume       = {134},
  year         = {2012},
}