Type
Zone
Age range
76.27–75.64 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Exiteloceras jenneyi
Didymoceras stevensoni
Didymoceras nebrascense
76.2576.2076.1576.1076.0576.0075.9575.9075.8575.8075.7575.7075.65

Macrostrat

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