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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 24, issue 1
J. Micropalaeontol., 24, 77–94, 2005
https://doi.org/10.1144/jm.24.1.77
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 24, 77–94, 2005
https://doi.org/10.1144/jm.24.1.77
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 May 2005

01 May 2005

Early Carboniferous (Late Tournaisian–Early Viséan) ostracods from the Ballagan Formation, central Scotland, UK

Mark Williams1,2, Michael Stephenson1, Ian P. Wilkinson1, Melanie J. Leng3, and C. Giles Miller4 Mark Williams et al.
  • 1British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
  • 2Current address: British Antarctic Survey, Geological Sciences Division, High Cross, Madingley Road, Cambridge CB3 0ET, UK (e-mail: )
  • 3NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
  • 4Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK

Keywords: Carboniferous, Tournaisian, ostracods, biostratigraphy, palaeoenvironments

Abstract. The Ballagan Formation (Late Tournaisian–Early Viséan) of central Scotland yields an ostracod fauna of 14 species in ten genera, namely Beyrichiopsis, Cavellina, Glyptolichvinella, Glyptopleura, Knoxiella, Paraparchites, Sansabella, Shemonaella, Silenites and Sulcella. The ostracods, in combination with palynomorphs, are important biostratigraphical indices for correlating the rock sequences, where other means of correlation, especially goniatites, conodonts, foraminifera, brachiopods or corals are absent. Stratigraphical distribution of the ostracods, calibrated with well-established palynomorph biozones, identifies three informally defined intervals: a sub-CM palynomorph Biozone interval with poor ostracod assemblages including Shemonaella scotoburdigalensis; a succeeding interval within the CM palynomorph Biozone where Cavellina coela, Cavellina incurvescens, Sansabella amplectans and the new species Knoxiella monarchella and Paraparchites discus first appear; and, an upper interval, in the upper CM Biozone, marked by the appearance of Sulcella affiliata. At least locally in central Scotland, S. affiliata permits a level of resolution equivalent to a sub-zonal upper division of the CM Biozone. The fauna, flora, sedimentology and stable isotope composition (δ13C and δ18O) of carbonate minerals in the Ballagan Formation suggest the ostracods inhabited brackish, hypersaline and ephemeral aquatic ecologies in a coastal floodplain setting.

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