Type
Zone
Age range
80.97–80.67 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites asperiformis
Baculites maclearni
Baculites obtusus
80.9880.9680.9480.9280.9080.8880.8680.8480.8280.8080.7880.7680.7480.7280.7080.6880.66

Macrostrat

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