Biomarker 6: Stensioeina granulata incondita FDO
Present in the Southern North Sea Jukes Formation. Mid Campanian (quadrata Zone). Bolivinoides culverensis, Stensioeina exsculpta gracilis and Gavelinella stelligera have FDOs with the biomarker.
Correlation: This biomarker can be placed at the top of BGS foraminiferal Biozone 20 (Wilkinson, 2000).