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