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Chitinozoan biozonation in the upper Katian and Hirnantian of the Welsh Basin, UK

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IGCP 591 The Early to Middle Paleozoic Revolution
Abstract
Here we present a chitinozoan biostratigraphical framework for the South Wales upper Katian and Hirnantian (Ashgill) succession. The current study indicates that three of the six Avalonian Ashgill chitinozoan biozones are recognised in the Welsh Basin; the bergstroemi, fossensis and umbilicata biozones. The Baltoscandian and Laurentian Hercochitina gamachiana biozone is suggested by the presence of Belonechitina cf. gamachiana and the Spinachitina taugourdeaui biozone is suggested by Spinachitina cf. taugourdeaui. Intervening between these is a newly erected lower Hirnantian regional biozone, the Belonechitina Ilangrannogensis n. sp. biozone. The late Katian (Cautleyan-Rawtheyan) Conochitina rugata biozone was not recognised, though the index taxon is recorded. The presence of B. cf. gamachiana below the lithological expression of the Hirnantian glacial maximum and alongside Rawtheyan graptolite and trilobite assemblages shows that the local base of the B. cf. gamachiana biozone lies beneath the Katian-Hirnantian boundary. Although at present in open nomenclature, the finds of B. cf. gamachiana and S. cf. taugourdeaui, from sites where these chitinozoans co-occur with graptolites, are potentially important; the area offers the potential to study how B. cf. gamachiana and S. cf. taugourdeaui are taxonomically and stratigraphically linked to the original index species. A composite Katian-Hirnantian chitinozoan biozonation for the Welsh Basin is presented and three new species are defined: Belonechitina Ilangrannogensis n. sp., Belonechitina ceregidionensis n. sp. and Spinachitina penbryniensis n. sp.
Keywords
Ordovician, Chitinozoan, Katian, Hirnantian, Welsh Basin, Avalonia, HISTORICAL TYPE AREA, UPPER ORDOVICIAN, ANTICOSTI ISLAND, VAUREAL FORMATION, SOUTHWEST WALES, KEY SECTIONS, BIOSTRATIGRAPHY, QUEBEC, GRAPTOLITES, SEDIMENTARY

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Chicago
Challands, Thomas J, Thijs Vandenbroucke, Howard A Armstrong, and Jeremy R Davies. 2014. “Chitinozoan Biozonation in the Upper Katian and Hirnantian of the Welsh Basin, UK.” Review of Palaeobotany and Palynology 210: 1–21.
APA
Challands, T. J., Vandenbroucke, T., Armstrong, H. A., & Davies, J. R. (2014). Chitinozoan biozonation in the upper Katian and Hirnantian of the Welsh Basin, UK. REVIEW OF PALAEOBOTANY AND PALYNOLOGY, 210, 1–21.
Vancouver
1.
Challands TJ, Vandenbroucke T, Armstrong HA, Davies JR. Chitinozoan biozonation in the upper Katian and Hirnantian of the Welsh Basin, UK. REVIEW OF PALAEOBOTANY AND PALYNOLOGY. 2014;210:1–21.
MLA
Challands, Thomas J, Thijs Vandenbroucke, Howard A Armstrong, et al. “Chitinozoan Biozonation in the Upper Katian and Hirnantian of the Welsh Basin, UK.” REVIEW OF PALAEOBOTANY AND PALYNOLOGY 210 (2014): 1–21. Print.
@article{6849153,
  abstract     = {Here we present a chitinozoan biostratigraphical framework for the South Wales upper Katian and Hirnantian (Ashgill) succession. The current study indicates that three of the six Avalonian Ashgill chitinozoan biozones are recognised in the Welsh Basin; the bergstroemi, fossensis and umbilicata biozones. The Baltoscandian and Laurentian Hercochitina gamachiana biozone is suggested by the presence of Belonechitina cf. gamachiana and the Spinachitina taugourdeaui biozone is suggested by Spinachitina cf. taugourdeaui. Intervening between these is a newly erected lower Hirnantian regional biozone, the Belonechitina Ilangrannogensis n. sp. biozone. The late Katian (Cautleyan-Rawtheyan) Conochitina rugata biozone was not recognised, though the index taxon is recorded. The presence of B. cf. gamachiana below the lithological expression of the Hirnantian glacial maximum and alongside Rawtheyan graptolite and trilobite assemblages shows that the local base of the B. cf. gamachiana biozone lies beneath the Katian-Hirnantian boundary. Although at present in open nomenclature, the finds of B. cf. gamachiana and S. cf. taugourdeaui, from sites where these chitinozoans co-occur with graptolites, are potentially important; the area offers the potential to study how B. cf. gamachiana and S. cf. taugourdeaui are taxonomically and stratigraphically linked to the original index species. A composite Katian-Hirnantian chitinozoan biozonation for the Welsh Basin is presented and three new species are defined: Belonechitina Ilangrannogensis n. sp., Belonechitina ceregidionensis n. sp. and Spinachitina penbryniensis n. sp.},
  author       = {Challands, Thomas J and Vandenbroucke, Thijs and Armstrong, Howard A and Davies, Jeremy R},
  issn         = {0034-6667},
  journal      = {REVIEW OF PALAEOBOTANY AND PALYNOLOGY},
  keyword      = {Ordovician,Chitinozoan,Katian,Hirnantian,Welsh Basin,Avalonia,HISTORICAL TYPE AREA,UPPER ORDOVICIAN,ANTICOSTI ISLAND,VAUREAL FORMATION,SOUTHWEST WALES,KEY SECTIONS,BIOSTRATIGRAPHY,QUEBEC,GRAPTOLITES,SEDIMENTARY},
  language     = {eng},
  pages        = {1--21},
  title        = {Chitinozoan biozonation in the upper Katian and Hirnantian of the Welsh Basin, UK},
  url          = {http://dx.doi.org/10.1016/j.revpalbo.2014.07.001},
  volume       = {210},
  year         = {2014},
}

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