BGS Zone 22 (=uppermost UKB18 of Hart et al., 1989)
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Base: Inception of Reussella szajnochae szajnochae.
Top: Inception of Bolivinoides draco miliaris.
Biomarkers:
- Globorotalites hiltermanni, Bolivina incrassata and Eponides beisseli all appear for the first time together with Reussella szajnochae szajnochae.
- Globotruncana bulloides bulloides becomes extinct at the top of the zone (at the top of the Beeston Chalk Member in East Angia).
Macrofaunal correlation: Middle B. mucronata zone.
Age: Campanian