Type
Zone
Age range
71.2–70.44 Ma

International Timescale

Late Cretaceous
Maastrichtian

Ammonite Zonation - Western Interior

Baculites clinolobatus
Baculites grandis
Baculites baculus
71.271.271.171.071.071.070.970.870.870.870.770.770.670.570.570.5

Macrostrat

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