Type
Zone
Age range
81.13–80.97 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites maclearni
Baculites obtusus
Baculites sp. (weak flank ribs)
81.1381.1281.1181.1081.0981.0881.0781.0681.0581.0481.0381.0281.0181.0080.9980.9880.97

Macrostrat

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