Type
Zone
Age range
70.44–70 Ma

International Timescale

Late Cretaceous
Maastrichtian

Ammonite Zonation - Western Interior

Hoploscaphites birkelundae
Baculites clinolobatus
Baculites grandis
70.4470.4270.4070.3870.3670.3470.3270.3070.2870.2670.2470.2270.2070.1870.1670.1470.1270.1070.0870.0670.0470.0270.00

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