Type
Zone
Age range
75.08–74.6 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites compressus
Didymoceras cheyennense
Exiteloceras jenneyi
75.1075.0875.0675.0475.0275.0074.9874.9674.9474.9274.9074.8874.8674.8474.8274.8074.7874.7674.7474.7274.7074.6874.6674.6474.6274.6074.58

Macrostrat

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