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New chitinozoans from the historical type area of the Hirnantian Stage and additional key sections in the Wye Valley, Wales, UK
Vandenbroucke, T.R.A.; Hennissen, J.; Zalasiewicz, J.A.; Verniers, J. (2008). New chitinozoans from the historical type area of the Hirnantian Stage and additional key sections in the Wye Valley, Wales, UK. Geol. J. 43(4): 397-414. dx.doi.org/10.1002/gj.1109
In: Geological Journal. Liverpool Geological Society/Manchester Geological Association: Liverpool. ISSN 0072-1050, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 279627 [ OMA ]

Keywords
Author keywords
    biostratigraphy; stratotype; chitinozoans; upper ordovician; hirnantian;wales

Authors  Top 
  • Vandenbroucke, T.R.A., more
  • Hennissen, J., more
  • Zalasiewicz, J.A.
  • Verniers, J., more

Abstract
    The type locality for several core elements of the Hirnantia brachiopod fauna is a small disused quarry on the western slopes of Cwm Hirnant. There, the Hirnant Limestone Member of the Foel-y-Ddinas Mudstone Formation yields a new, well-preserved chitinozoan assemblage, attributed to the Spinachitina taugourdeaui Biozone. This allows tight correlation with the Hirnantian of Baltica and Laurentia and neatly ties the chitinozoan zonation with the classical brachiopod fauna. Nearby, the chitinozoan assemblage from the Caradoc Cymerig Limestone Member at Gelli-grîn belongs to the Spinachitina cervicornis Biozone?, and is identical to that recovered from the Burrellian in the Onny Valley, Welsh Borderland. A Silurian assemblage higher up section, discovered in the Cwm-yr-Aethnen Formation, is attributed to the globally recognized Eisenackitina dolioliformis Biozone. Attempts to integrate the chitinozoan and graptolite biozonation, in the central Welsh Rhayader area, were less successful.

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