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Volume 37, issue 1 | Copyright
J. Micropalaeontol., 37, 231-247, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Jan 2018

Research article | 30 Jan 2018

A brief warming event in the late Albian: evidence from calcareous nannofossils, macrofossils, and isotope geochemistry of the Gault Clay Formation, Folkestone, southeastern England

Sudeep Kanungo1, Paul R. Bown2, Jeremy R. Young2, and Andrew S. Gale3 Sudeep Kanungo et al.
  • 1University of Utah, Energy & Geoscience Institute (EGI), 423 Wakara Way, # 300, Salt Lake City, Utah 84108, USA
  • 2Dept. of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
  • 3School of Earth & Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK

Abstract. This paper documents a warming event across the middle–upper Albian interval in a ∼22m long section from the Gault Clay Formation of Copt Point, Folkestone (UK). Evidence for the event comes from three independent datasets: calcareous nannofossils, ammonites, and the bulk sediment carbon and oxygen stable isotope record, which collectively indicate a brief period (∼ 500kyr) of significant surface water warming (in excess of 6°C) at around 107.5Ma (the base of the Dipoloceras cristatum Ammonite Zone). A surface water productivity increase based on high percentages of the eutrophic nannofossil Zeugrhabdotus noeliae is found to be concomitant with this warming event, suggesting that surface waters were nutrient-rich and the warming was associated with increased precipitation and run-off, delivering more nutrients into the basin.

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This paper documents a regional warming event in the Albian of the Anglo-Paris Basin and its palaeoclimatic and palaeoceanographic implications. This multi-proxy study utilizes three independent datasets to confirm the warming event that lasted ~ 500 kyr around the middle–upper Albian boundary. The research involved a field study of the Gault Clay (UK) with an in-depth analysis of nannofossils, bulk sediment carbon and oxygen isotopes, and an investigation of ammonites from the formation.
This paper documents a regional warming event in the Albian of the Anglo-Paris Basin and its...