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A new upper Middle Ordovician-Lower Silurian drillcore standard succession from Borenshult in Ostergotland, southern Sweden: 1. Stratigraphical review with regional comparisons

Bergstroem, Stig M.; Calner, Mikael LU ; Lehnert, Oliver and Noor, Amir (2011) In GFF 133(3-4). p.149-171
Abstract
A recent drilling at Borenshult near Motala resulted in discovery of the stratigraphically most complete succession through the upper Darriwilian-Rhuddanian interval known in Ostergotland. The approximately 70m long drillcore succession is subdivided into eight formations, the oldest being the late Darriwilian Furudal Limestone and the youngest being the Rhuddanian Motala Formation. Conodonts are used for a detailed biostratigraphic classification of the Borenshult drillcore into three subzones of the Pygodus serra Zone, two subzones of the Pygodus anserinus Zone, and three subzones of the Amorphognathus tvaerensis Zone. The base of the Amorphognathus superbus Zone is taken to be similar to 10m above the Kinnekulle K-bentonite, that of the... (More)
A recent drilling at Borenshult near Motala resulted in discovery of the stratigraphically most complete succession through the upper Darriwilian-Rhuddanian interval known in Ostergotland. The approximately 70m long drillcore succession is subdivided into eight formations, the oldest being the late Darriwilian Furudal Limestone and the youngest being the Rhuddanian Motala Formation. Conodonts are used for a detailed biostratigraphic classification of the Borenshult drillcore into three subzones of the Pygodus serra Zone, two subzones of the Pygodus anserinus Zone, and three subzones of the Amorphognathus tvaerensis Zone. The base of the Amorphognathus superbus Zone is taken to be similar to 10m above the Kinnekulle K-bentonite, that of the Amorphognathus ordovicicus just below the Fjacka Shale, and that of the Ozarkodina hassi Zone at the base of the Middle Member of the Loka Formation. Because of its unique lithology and paleontology and its wide geographic occurrence, this member is formally named herein the Skultorp Member. The previously uncertain stratigraphical position of the internationally known "Borenshult fauna" is shown to correlate with the Skultorp Member. A regional comparison of the Borenshult drillcore succession shows it to be most similar to coeval successions in Vastergotland and Dalarna but there are some significant regional differences. The average rate of net rock accumulation during late Darriwilian and Sandbian time is calculated to be similar to 3-4 mm/ka. (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
Middle and Upper Ordovician, Rhuddanian, stratigraphy, conodont, biostratigraphy, Borenshult fauna, Sweden
in
GFF
volume
133
issue
3-4
pages
149 - 171
publisher
Geological Society of Sweden
external identifiers
  • wos:000299035100005
  • scopus:84859032538
ISSN
2000-0863
DOI
10.1080/11035897.2011.622049
language
English
LU publication?
yes
id
e98afa4a-90a1-4264-b700-f0acd3daf40b (old id 2494283)
date added to LUP
2012-06-04 14:23:22
date last changed
2017-09-24 03:19:05
@article{e98afa4a-90a1-4264-b700-f0acd3daf40b,
  abstract     = {A recent drilling at Borenshult near Motala resulted in discovery of the stratigraphically most complete succession through the upper Darriwilian-Rhuddanian interval known in Ostergotland. The approximately 70m long drillcore succession is subdivided into eight formations, the oldest being the late Darriwilian Furudal Limestone and the youngest being the Rhuddanian Motala Formation. Conodonts are used for a detailed biostratigraphic classification of the Borenshult drillcore into three subzones of the Pygodus serra Zone, two subzones of the Pygodus anserinus Zone, and three subzones of the Amorphognathus tvaerensis Zone. The base of the Amorphognathus superbus Zone is taken to be similar to 10m above the Kinnekulle K-bentonite, that of the Amorphognathus ordovicicus just below the Fjacka Shale, and that of the Ozarkodina hassi Zone at the base of the Middle Member of the Loka Formation. Because of its unique lithology and paleontology and its wide geographic occurrence, this member is formally named herein the Skultorp Member. The previously uncertain stratigraphical position of the internationally known "Borenshult fauna" is shown to correlate with the Skultorp Member. A regional comparison of the Borenshult drillcore succession shows it to be most similar to coeval successions in Vastergotland and Dalarna but there are some significant regional differences. The average rate of net rock accumulation during late Darriwilian and Sandbian time is calculated to be similar to 3-4 mm/ka.},
  author       = {Bergstroem, Stig M. and Calner, Mikael and Lehnert, Oliver and Noor, Amir},
  issn         = {2000-0863},
  keyword      = {Middle and Upper Ordovician,Rhuddanian,stratigraphy,conodont,biostratigraphy,Borenshult fauna,Sweden},
  language     = {eng},
  number       = {3-4},
  pages        = {149--171},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {A new upper Middle Ordovician-Lower Silurian drillcore standard succession from Borenshult in Ostergotland, southern Sweden: 1. Stratigraphical review with regional comparisons},
  url          = {http://dx.doi.org/10.1080/11035897.2011.622049},
  volume       = {133},
  year         = {2011},
}