Gaster (1924, 1927, 1929, 1932, 1937, 1941, 1944) - Schloenbachia varians Zone

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Biostratigraphical correlation: Inferred to equate with the M. mantelli Zone, M. dixoni Zone and C. inerme Zone of current usage.

Lithostratigraphical correlation: Inferred to equate with the West Melbury Marly Chalk Formation of southern England.

Subzones: Stauronema carteri Subzone

Age: Early to Mid Cenomanian