Biomarker 5: Gavelinella usakensis FDO

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Present in the Jukes Formation of the Southern North Sea (early Late Campanian, early part of the mucronata Zone). Accompanied by Gavelinella lorneiana, G. clementiana and Reussella szajnochae praecursor.

Correlation: This biomarker can be placed within BGS foraminiferal Biozone 21 (Wilkinson, 2000).