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The base of the global Dapingian Stage (Ordovician) in Baltoscandia: conodonts, graptolites and unconformities

Bergstrom, Stig M. and Löfgren, Anita LU (2009) In Earth and Environmental Science Transactions of the Royal Society of Edinburgh2007-01-01+01:00 99. p.189-212
Abstract
In the recently completed and formally ratified new series and stage classification of the Ordovician System, the base of the Middle Ordovician Series coincides with the base of the global Dapingian Stage. In the Global Stratotype Section and Point (GSSP) of this stage, which is located at Huanghuachang in southern China, the base of the Dapingian Stage is defined its the level of first appearance of the conodont Baltoniodus triangularis. The fact that this species, along with some other taxa present at the Dapingian GSSP, Occurs in many sections in Baltoscandia makes it possible to recognise with considerable precision the level of this global stage boundary in Sweden, Estonia, northwestern Russia, and Denmark. In several, but not all,... (More)
In the recently completed and formally ratified new series and stage classification of the Ordovician System, the base of the Middle Ordovician Series coincides with the base of the global Dapingian Stage. In the Global Stratotype Section and Point (GSSP) of this stage, which is located at Huanghuachang in southern China, the base of the Dapingian Stage is defined its the level of first appearance of the conodont Baltoniodus triangularis. The fact that this species, along with some other taxa present at the Dapingian GSSP, Occurs in many sections in Baltoscandia makes it possible to recognise with considerable precision the level of this global stage boundary in Sweden, Estonia, northwestern Russia, and Denmark. In several, but not all, regions, especially in the East Baltic, the global stage boundary coincides with the base of the regional Volkhov Stage and Call be tied to the base of the Megistaspis polyphemus Trilobite Zone. The regionally somewhat different relationships between the position of the global stage boundary and a very widespread hardground complex are probably due to the occurrence of local and/or regional unconformities in the upper Floian-lower Dapingian interval. Although biostratigraphically important graptolites are present in the study interval in some Baltoscandic sections, the precise graptolite correlation of the base of the Dapingian Stage remains somewhat unclear, although it appears to be near, or at, the base of the Isograptus victoriae victoriae Zone (Ca 2). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
sequence stratigraphy, GSSP, graptolite zones, conodont zones, China, Baltoscandia, biostratigraphy
in
Earth and Environmental Science Transactions of the Royal Society of Edinburgh2007-01-01+01:00
volume
99
pages
189 - 212
publisher
Royal Society of Edinburgh
external identifiers
  • wos:000273602600004
  • scopus:73449138430
ISSN
1755-6929
DOI
10.1017/S1755691009008081
language
English
LU publication?
yes
id
2ffc4f2a-2efd-45b3-ba6e-b8b8301ad9f5 (old id 1546654)
date added to LUP
2010-02-25 14:09:55
date last changed
2017-10-08 03:26:03
@article{2ffc4f2a-2efd-45b3-ba6e-b8b8301ad9f5,
  abstract     = {In the recently completed and formally ratified new series and stage classification of the Ordovician System, the base of the Middle Ordovician Series coincides with the base of the global Dapingian Stage. In the Global Stratotype Section and Point (GSSP) of this stage, which is located at Huanghuachang in southern China, the base of the Dapingian Stage is defined its the level of first appearance of the conodont Baltoniodus triangularis. The fact that this species, along with some other taxa present at the Dapingian GSSP, Occurs in many sections in Baltoscandia makes it possible to recognise with considerable precision the level of this global stage boundary in Sweden, Estonia, northwestern Russia, and Denmark. In several, but not all, regions, especially in the East Baltic, the global stage boundary coincides with the base of the regional Volkhov Stage and Call be tied to the base of the Megistaspis polyphemus Trilobite Zone. The regionally somewhat different relationships between the position of the global stage boundary and a very widespread hardground complex are probably due to the occurrence of local and/or regional unconformities in the upper Floian-lower Dapingian interval. Although biostratigraphically important graptolites are present in the study interval in some Baltoscandic sections, the precise graptolite correlation of the base of the Dapingian Stage remains somewhat unclear, although it appears to be near, or at, the base of the Isograptus victoriae victoriae Zone (Ca 2).},
  author       = {Bergstrom, Stig M. and Löfgren, Anita},
  issn         = {1755-6929},
  keyword      = {sequence stratigraphy,GSSP,graptolite zones,conodont zones,China,Baltoscandia,biostratigraphy},
  language     = {eng},
  pages        = {189--212},
  publisher    = {Royal Society of Edinburgh},
  series       = {Earth and Environmental Science Transactions of the Royal Society of Edinburgh2007-01-01+01:00},
  title        = {The base of the global Dapingian Stage (Ordovician) in Baltoscandia: conodonts, graptolites and unconformities},
  url          = {http://dx.doi.org/10.1017/S1755691009008081},
  volume       = {99},
  year         = {2009},
}