Type
Zone
Age range
76.94–76.27 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Didymoceras stevensoni
Didymoceras nebrascense
Baculites scotti
77.076.976.876.876.876.776.776.676.576.576.576.476.376.376.3

Macrostrat

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