Type
Zone
Age range
69.91–69.3 Ma

International Timescale

Late Cretaceous
Maastrichtian

Ammonite Zonation - Western Interior

Jeletzkytes nebrascensis
Hoploscaphites nicolleti
Hoploscaphites birkelundae
69.9069.8569.8069.7569.7069.6569.6069.5569.5069.4569.4069.3569.30

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