Type
Zone
Age range
73.91–73.63 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites jenseni
Baculites reesidei
Baculites cuneatus
73.9273.9073.8873.8673.8473.8273.8073.7873.7673.7473.7273.7073.6873.6673.6473.62

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