Type
Zone
Age range
80.67–80.21 Ma

International Timescale

Late Cretaceous
Campanian

Ammonite Zonation - Western Interior

Baculites sp. (smooth II)
Baculites asperiformis
Baculites maclearni
80.6880.6680.6480.6280.6080.5880.5680.5480.5280.5080.4880.4680.4480.4280.4080.3880.3680.3480.3280.3080.2880.2680.2480.2280.20

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