Type
Zone
Age range
88.77–87.86 Ma

International Timescale

Late Cretaceous
Coniacian

Ammonite Zonation - Western Interior

Clioscaphites saxitonianus
Scaphites depressus
Scaphites ventricosus
88.888.888.788.788.688.588.588.588.488.388.388.388.288.288.188.088.088.087.987.8

Macrostrat

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