Turonian-Coniacian calcareous nannofossils were documented from three sections in south-eastern England: Baldock Bypass, a temporary road-cut section in Hertfordshire; Kensworth Quarry, Berkshire; and New Pit Depot, Sussex. The sections were dated and correlated using nannofossil biostratigraphy and lithostratigraphy. Quantitative assemblage data reveal a synchronous acme event of Braarudosphaera and Nannoconus in the Baldock and Kensworth sections close to the Turonian/Coniacian boundary, which may have been caused by shallowing. Morphometric data highlight dwarfing trends in the species Watznaueria barnesiae, with smaller coccoliths occurring in volcanically-derived marls, suggesting a possible productivity control, related to increased nutrient input.
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Wyton et al. (2007) studied this question.
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