Type
Zone
Age range
69.3–68.69 Ma

International Timescale

Late Cretaceous
Maastrichtian

Ammonite Zonation - Western Interior

Jeletzkytes nebrascensis
Hoploscaphites nicolleti
69.3069.2569.2069.1569.1069.0569.0068.9568.9068.8568.8068.7568.70

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