Type
Zone
Age range
74.6–74.21 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites cuneatus
Baculites compressus
Didymoceras cheyennense
74.6074.5874.5674.5474.5274.5074.4874.4674.4474.4274.4074.3874.3674.3474.3274.3074.2874.2674.2474.2274.20

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