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Chitinozoan biostratigraphy of the Silurian Wenlock–Ludlow boundary succession of the Long Mountain, Powys, Wales

Thomas Steeman UGent, Thijs Vandenbroucke UGent, Mark Williams, Jacques Verniers UGent, Vincent Perrier, David J Siveter, James Wilkinson, Jan Zalasiewicz and Poul Emsbo (2016) GEOLOGICAL MAGAZINE. 153(1). p.95-109
abstract
Systematic collecting through the upper Wenlock (upper Homerian) and lower Ludlow (Gorstian and lowermost Ludfordian) Silurian rock succession of the Long Mountain, Powys, Wales, identifies some 48 chitinozoan species that distinguish four biozones, two subzones and an interregnum. Consideration of the chitinozoan biozones together with those of the graptolites enables a local three-fold subdivision of the late Homerian lundgreni graptolite Biozone, and the distinction of lower and upper intervals for the Gorstian incipiens graptolite Biozone. The base of the Ludlow Series in the Long Mountain more or less equates to the base of the Cingulochitina acme chitinozoan Biozone, although no key chitinozoan first or last appearance datums are associated with the series boundary itself. The new graptolite-chitinozoan biozonation allows enhanced correlation between upper Wenlock and lower Ludlow sedimentary deposits of the Lower Palaeozoic Welsh depositional basin and those of the palaeo-shelf in the stratotype Wenlock and Ludlow areas of Shropshire. Chitinozoans seem affected by the phenomena that caused the late Wenlock 'Mulde extinction' in graptolites but, with the final disappearance of 9 species and re-appearance of 11 species following an interval of overall low diversity, they seem to have suffered less severely than their macro-zooplanktonic contemporaries.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Welsh Basin, Wenlock–Ludlow, biostratigraphy, chitinozoans, graptolites, GRAPTOLITE BIOSTRATIGRAPHY, WELSH BASIN, AREA, BIOZONATION, SECTION, ENGLAND, SERIES, BEDS
journal title
GEOLOGICAL MAGAZINE
Geol. Mag.
volume
153
issue
1
pages
95 - 109
Web of Science type
Article
Web of Science id
000367730200006
JCR category
GEOSCIENCES, MULTIDISCIPLINARY
JCR impact factor
1.965 (2016)
JCR rank
84/188 (2016)
JCR quartile
2 (2016)
ISSN
0016-7568
DOI
10.1017/S0016756815000266
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
7090178
handle
http://hdl.handle.net/1854/LU-7090178
date created
2016-02-18 10:16:19
date last changed
2016-12-19 15:47:37
@article{7090178,
  abstract     = {Systematic collecting through the upper Wenlock (upper Homerian) and lower Ludlow (Gorstian and lowermost Ludfordian) Silurian rock succession of the Long Mountain, Powys, Wales, identifies some 48 chitinozoan species that distinguish four biozones, two subzones and an interregnum. Consideration of the chitinozoan biozones together with those of the graptolites enables a local three-fold subdivision of the late Homerian lundgreni graptolite Biozone, and the distinction of lower and upper intervals for the Gorstian incipiens graptolite Biozone. The base of the Ludlow Series in the Long Mountain more or less equates to the base of the Cingulochitina acme chitinozoan Biozone, although no key chitinozoan first or last appearance datums are associated with the series boundary itself. The new graptolite-chitinozoan biozonation allows enhanced correlation between upper Wenlock and lower Ludlow sedimentary deposits of the Lower Palaeozoic Welsh depositional basin and those of the palaeo-shelf in the stratotype Wenlock and Ludlow areas of Shropshire. Chitinozoans seem affected by the phenomena that caused the late Wenlock 'Mulde extinction' in graptolites but, with the final disappearance of 9 species and re-appearance of 11 species following an interval of overall low diversity, they seem to have suffered less severely than their macro-zooplanktonic contemporaries.},
  author       = {Steeman, Thomas and Vandenbroucke, Thijs and Williams, Mark and Verniers, Jacques and Perrier, Vincent and Siveter, David J and Wilkinson, James and Zalasiewicz, Jan and Emsbo, Poul},
  issn         = {0016-7568},
  journal      = {GEOLOGICAL MAGAZINE},
  keyword      = {Welsh Basin,Wenlock--Ludlow,biostratigraphy,chitinozoans,graptolites,GRAPTOLITE BIOSTRATIGRAPHY,WELSH BASIN,AREA,BIOZONATION,SECTION,ENGLAND,SERIES,BEDS},
  language     = {eng},
  number       = {1},
  pages        = {95--109},
  title        = {Chitinozoan biostratigraphy of the Silurian Wenlock--Ludlow boundary succession of the Long Mountain, Powys, Wales},
  url          = {http://dx.doi.org/10.1017/S0016756815000266},
  volume       = {153},
  year         = {2016},
}

Chicago
Steeman, Thomas, Thijs Vandenbroucke, Mark Williams, Jacques Verniers, Vincent Perrier, David J Siveter, James Wilkinson, Jan Zalasiewicz, and Poul Emsbo. 2016. “Chitinozoan Biostratigraphy of the Silurian Wenlock–Ludlow Boundary Succession of the Long Mountain, Powys, Wales.” Geological Magazine 153 (1): 95–109.
APA
Steeman, T., Vandenbroucke, T., Williams, M., Verniers, J., Perrier, V., Siveter, D. J., Wilkinson, J., et al. (2016). Chitinozoan biostratigraphy of the Silurian Wenlock–Ludlow boundary succession of the Long Mountain, Powys, Wales. GEOLOGICAL MAGAZINE, 153(1), 95–109.
Vancouver
1.
Steeman T, Vandenbroucke T, Williams M, Verniers J, Perrier V, Siveter DJ, et al. Chitinozoan biostratigraphy of the Silurian Wenlock–Ludlow boundary succession of the Long Mountain, Powys, Wales. GEOLOGICAL MAGAZINE. 2016;153(1):95–109.
MLA
Steeman, Thomas, Thijs Vandenbroucke, Mark Williams, et al. “Chitinozoan Biostratigraphy of the Silurian Wenlock–Ludlow Boundary Succession of the Long Mountain, Powys, Wales.” GEOLOGICAL MAGAZINE 153.1 (2016): 95–109. Print.