Rowe (1900) - Belemnitella mucronata Zone

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Biostratigraphical correlation: Equates with an interval from the top of the G. quadrata Zone to presumably the top of the B. mucronata Zone of current usage. Rowe (1908) fixed the base of the B. mucronata Zone in the Isle of Wight using the lowest occurrence of the index species, but its range is within the top of the G. quadrata Zone (the top of which is placed at the highest record of Gonioteuthis) of current usage.

Lithostratigraphical correlation: Equates with all but the basal part of the Portsdown Chalk Formation (including the equivalent of the Studland Chalk) of southern England.

Age: Campanian.