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

This paper documents a warming event across the middle–upper Albian interval in a ∼ 22 m 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 oxyge...

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Bibliographic Details
Published in:Journal of micropalaeontology 2018-01, Vol.37 (1), p.231-247
Main Authors: Kanungo, Sudeep, Bown, Paul R., Young, Jeremy R., Gale, Andrew S.
Format: Article
Language:English
Subjects:
Clay
Eutrophic environments
Eutrophication
Geochemistry
Nutrients
Stable isotopes
Surface water
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Summary:This paper documents a warming event across the middle–upper Albian interval in a ∼ 22 m 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 (∼ 500 kyr) of significant surface water warming (in excess of 6 ∘C) at around 107.5 Ma (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.
ISSN:2041-4978
0262-821X
2041-4978
DOI:10.5194/jm-37-231-2018