BGS Zone 9 (=modified UKB9 of Hart et al., 1989)
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Base: Inception of Valvulineria lenticularis and Praeglobotruncana helvetica.
Top: Inception of Globorotalites michelinianus and extinction of Lingulogavelinella globosa.
Biomarkers:
- Whiteinella aprica appears in the early Mytiloides spp macrofaunal zone.
- The extinction of Dicarinella hagni and D. algeriana together with the inception of Marginotruncana sigali in the ‘mid’ Mytiloides spp macrofaunal zone.
- Gavelinella tourainensis generally temporarily disappears from the record at the top of the zone (Lazarus Effect).
Macrofaunal correlation: uppermost N. juddi Zone to upper Mytiloides spp. Zone.
Age: Latest Cenomanian & Early Turonian