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The GSSP of the second (Upper) stage of the Lower Ordovician series: Diabasbrottet at Hunneberg, province of Vastergotland, southwestern Sweden

Bergstrom, S M; Löfgren, Anita LU and Maletz, J (2004) In Episodes 27(4). p.265-272
Abstract
Diabasbrottet, selected by the International Subcommisson on Ordovician Stratigraphy and in 2002 ratified by the International Commission on Stratigraphy as the GSSP of the Second (Upper) Stage of the Lower Ordovician, is located on the Hunneberg Mountain in southwestern Sweden. The stratigraphic succession represents an outer shelf environment near the Baltic Shield margin. The shale-dominated, biostratigraphically complete, richly fossiliferous boundary interval is completely exposed in a disused quarry. The GSSP is in the lower TOyen Shale 2.1 m above the top of the Cambrian and is marked by the first appearance of the graptolite Tetragraptus approximatus Nicholson. The boundary interval contains a diverse graptolite fauna and... (More)
Diabasbrottet, selected by the International Subcommisson on Ordovician Stratigraphy and in 2002 ratified by the International Commission on Stratigraphy as the GSSP of the Second (Upper) Stage of the Lower Ordovician, is located on the Hunneberg Mountain in southwestern Sweden. The stratigraphic succession represents an outer shelf environment near the Baltic Shield margin. The shale-dominated, biostratigraphically complete, richly fossiliferous boundary interval is completely exposed in a disused quarry. The GSSP is in the lower TOyen Shale 2.1 m above the top of the Cambrian and is marked by the first appearance of the graptolite Tetragraptus approximatus Nicholson. The boundary interval contains a diverse graptolite fauna and biostratigraphically diagnostic conodonts and trilobites that make it possible to define the boundary in terms of zone schemes based on these groups. In this respect, the Diabasbrottet and nearby sections are unique in the world among described localities having this boundary interval. Based on the appearance of T. approximatus, the base of the Second Stage can be identified in many graptolitiferous successions round the world but this level is currently more difficult to recognize precisely in some carbonate sequences outside Baltoscandia. We propose the Second Stage be called the Floan Stage. It is named for the Village of Flo, which is situated about 5 km southeast of the GSSP. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Episodes
volume
27
issue
4
pages
265 - 272
publisher
International Union of Geological Sciences
external identifiers
  • wos:000227025700005
  • scopus:12244283752
ISSN
0705-3797
language
English
LU publication?
yes
id
760b5da2-39ae-43eb-8076-ceff6c6b3aba (old id 253762)
alternative location
http://www.episodes.org/backissues/274/265-272%20Bergstrom.pdf
date added to LUP
2007-10-17 08:42:47
date last changed
2017-10-01 04:37:20
@article{760b5da2-39ae-43eb-8076-ceff6c6b3aba,
  abstract     = {Diabasbrottet, selected by the International Subcommisson on Ordovician Stratigraphy and in 2002 ratified by the International Commission on Stratigraphy as the GSSP of the Second (Upper) Stage of the Lower Ordovician, is located on the Hunneberg Mountain in southwestern Sweden. The stratigraphic succession represents an outer shelf environment near the Baltic Shield margin. The shale-dominated, biostratigraphically complete, richly fossiliferous boundary interval is completely exposed in a disused quarry. The GSSP is in the lower TOyen Shale 2.1 m above the top of the Cambrian and is marked by the first appearance of the graptolite Tetragraptus approximatus Nicholson. The boundary interval contains a diverse graptolite fauna and biostratigraphically diagnostic conodonts and trilobites that make it possible to define the boundary in terms of zone schemes based on these groups. In this respect, the Diabasbrottet and nearby sections are unique in the world among described localities having this boundary interval. Based on the appearance of T. approximatus, the base of the Second Stage can be identified in many graptolitiferous successions round the world but this level is currently more difficult to recognize precisely in some carbonate sequences outside Baltoscandia. We propose the Second Stage be called the Floan Stage. It is named for the Village of Flo, which is situated about 5 km southeast of the GSSP.},
  author       = {Bergstrom, S M and Löfgren, Anita and Maletz, J},
  issn         = {0705-3797},
  language     = {eng},
  number       = {4},
  pages        = {265--272},
  publisher    = {International Union of Geological Sciences},
  series       = {Episodes},
  title        = {The GSSP of the second (Upper) stage of the Lower Ordovician series: Diabasbrottet at Hunneberg, province of Vastergotland, southwestern Sweden},
  volume       = {27},
  year         = {2004},
}