Type
Zone
Age range
79.64–79.01 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites gregoryensis
Baculites perplexus
Baculites sp. (smooth II)
79.6579.6079.5579.5079.4579.4079.3579.3079.2579.2079.1579.1079.0579.00

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