Type
Zone
Age range
74.21–73.91 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites reesidei
Baculites cuneatus
Baculites compressus
74.2274.2074.1874.1674.1474.1274.1074.0874.0674.0474.0274.0073.9873.9673.9473.9273.90

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