Gaster (1924, 1927, 1929, 1932, 1937, 1941, 1944) - Holaster subglobosus Zone

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Biostratigraphical correlation: Equates with the A. rhotomagense Zone, A. jukesbrownei Zone, C. guerangeri Zone and M. geslinianum Zone (pars) of current usage.

Lithostratigraphical correlation: Equates with the Zig Zag Chalk Formation and basal Holywell Nodular Chalk Formation of southern England.

Subzone: Actinocamax plenus Subzone

Age: Mid to Late Cenomanian