Type
Zone
Age range
73.63–73.27 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites eliasi
Baculites jenseni
Baculites reesidei
73.6473.6273.6073.5873.5673.5473.5273.5073.4873.4673.4473.4273.4073.3873.3673.3473.3273.3073.2873.26

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