Type
Zone
Age range
95.98–95.9 Ma

International Timescale

Late Cretaceous
Cenomanian

Ammonite Zonation - Western Interior

Acanthoceras amphibolum
Acanthoceras bellense
Acanthoceras muldoonense
95.9895.9795.9795.9795.9695.9595.9595.9495.9495.9495.9395.9295.9295.9295.9195.9195.90

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