Griffith & Brydone (1911); Brydone (1912) - Offaster pilula Zone
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Biostratigraphical correlation: Equates with an interval from within the U. anglicus Zone to the top of the O. pilula Zone of current usage (Young & Lake, 1988).
Lithostratigraphical correlation: Equates with the middle to higher part of the Newhaven Chalk Formation of southern England.
| Subzones: | abundant O. pilula Subzone |
| E. depressula Subzone |
Age: Campanian