BGS Zone 26(=UKB22 of Hart et al., 1989)

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Base: Inception of Bolivinoides draco draco (not seen onshore, but present in the North Sea Basin).

Top: Inception of Abomphalus mayaroensis (not seen onshore, but present in the North Sea Basin).

Biomarkers:

  • Abomphalus intermedia and Rosita patelliformis appear at or near the base of the foraminifera zone.

Macrofaunal correlation: Early B. occidentalis Zone s.l. and ?B. junior Zone.

Age: Maastrichtian