Type
Zone
Age range
75.64–75.08 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Didymoceras cheyennense
Exiteloceras jenneyi
Didymoceras stevensoni
75.6575.6075.5575.5075.4575.4075.3575.3075.2575.2075.1575.10

Macrostrat

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