Type
Zone
Age range
84.08–83.64 Ma

International Timescale

Late Cretaceous
Santonian

Ammonite Zonation - Western Interior

Scaphites hippocrepis
Scaphites leei
Desmoscaphites bassleri
84.0884.0684.0484.0284.0083.9883.9683.9483.9283.9083.8883.8683.8483.8283.8083.7883.7683.7483.7283.7083.6883.6683.64

Macrostrat

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