Abstract
Abstract. Beautifully preserved dinoflagellate cysts continue to be discovered in UK Cretaceous chalks and provide important new biostratigraphic information. Five new species – Conosphaeridium norfolkense sp. nov., Glaphyrocysta coniacia sp. nov., Impletosphaeridium banterwickense sp. nov., Sentusidinium devonense sp. nov., Sentusidinium spinosum sp. nov. and the new subspecies Spiniferites ramosus subsp. ginakrogiae subsp. nov. – are described from Upper Cretaceous strata of the British Geological Survey (BGS) Banterwick Barn and Trunch boreholes (onshore UK). An emended diagnosis for Odontochitina diducta Pearce is also provided to broaden the morphological variability in the type material.
Highlights
Cretaceous chalks from onshore UK boreholes have recently yielded beautifully preserved dinoflagellate cysts (Prince et al, 1999, 2008; Pearce et al, 2003, 2011; Pearce, 2010) but many undescribed forms continue to be found
This paper describes five new species and one new subspecies from the British Geological Survey (BGS) Banterwick Barn (Berkshire; northern AngloParis Basin) and BGS Trunch borehole (Norfolk, southern North Sea Basin; Fig. 1)
All slides are lodged at the British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham, UK
Summary
Cretaceous chalks from onshore UK boreholes have recently yielded beautifully preserved dinoflagellate cysts (Prince et al, 1999, 2008; Pearce et al, 2003, 2011; Pearce, 2010) but many undescribed forms continue to be found. This paper describes five new species and one new subspecies from the British Geological Survey (BGS) Banterwick Barn (Berkshire; northern AngloParis Basin) and BGS Trunch borehole (Norfolk, southern North Sea Basin; Fig. 1)
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