Type
Zone
Age range
77.63–76.94 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Didymoceras nebrascense
Baculites scotti
Baculites reduncus
77.777.677.577.577.577.477.377.377.377.277.277.177.077.077.0

Macrostrat

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