Type
Zone
Age range
80.21–79.64 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites perplexus
Baculites sp. (smooth II)
Baculites asperiformis
80.2080.1580.1080.0580.0079.9579.9079.8579.8079.7579.7079.65

Macrostrat

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