Gaster (1924, 1927, 1929, 1932, 1937, 1941, 1944) - Belemnitella mucronata Zone

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Biostratigraphical correlation: Appears to equate with the interval from the base of the B. mucronata Zone, as currently recognised, to the top of the Chalk Group in southern England.

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

Age: Campanian