Type
Zone
Age range
98.19–97.76 Ma

International Timescale

Late Cretaceous
Cenomanian

Ammonite Zonation - Western Interior

Neogastroplites maclearni
Neogastroplites americanus
98.2098.1898.1698.1498.1298.1098.0898.0698.0498.0298.0097.9897.9697.9497.9297.9097.8897.8697.8497.8297.8097.7897.76

Macrostrat

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