BGS Zone 23 (=UKB19 of Hart et al., 1989)
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Base: Inception of Bolivinoides draco miliaris and B. sidestrandensis.
Top: Inception of Bolivinoides peterssoni.
Biomarkers:
- Heterohelix complanata has its inception at the base of the zone.
- Reussella szajnochae szajnochae occurs in flood proportion immediately below the Maastrichtian.
- A number of species become extinct at the upper boundary of the foraminifera zone, including Reussella szajnochae szajnochae, Neoflabellina rugosa, Gavelinella monterelensis, Globorotalites hiltermanni and Osangularia cordieriana.
Macrofaunal correlation: upper B. mucronata Zone (= Paramoudra Chalk of East Anglia)
Age: Latest Campanian