Griffith & Brydone (1911); Brydone (1912) - Belemnitella mucronata Zone

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Biostratigraphical correlation: Equates with the topmost G. quadrata Zone and B. mucronata Zone, or is co-extensive with the B. mucronata Zone of current usage (Griffith & Brydone, 1911; Brydone, 1912; Wood, WH/95/31R).

Lithostratigraphical correlation: Equates with all but the basal part of the Portsdown Chalk Formation of southern England.

Age: Campanian