Type
Zone
Age range
91.41–91.34 Ma

International Timescale

Late Cretaceous
Turonian

Ammonite Zonation - Western Interior

Scaphites whitfieldi
Scaphites warreni
Prionocyclus macombi
91.4191.4191.4091.3991.3991.3991.3891.3891.3791.3691.3691.3691.3591.3491.34

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