Griffith & Brydone (1911); Brydone (1912) - Holaster subglobosus Zone

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Biostratigraphical correlation: Inferred to equate with the A. rhotomagense Zone, A. jukesbrownei Zone and C. guerangeri Zone.

Lithostratigraphical correlation: Inferred to equate with the Zig Zag Chalk Formation of southern England.

Age: Mid to Late Cenomanian