Type
Zone
Age range
70–69.91 Ma

International Timescale

Late Cretaceous
Maastrichtian

Ammonite Zonation - Western Interior

Hoploscaphites nicolleti
Hoploscaphites birkelundae
Baculites clinolobatus
70.0070.0069.9969.9869.9869.9769.9769.9769.9669.9569.9569.9469.9469.9469.9369.9269.9269.9269.91

Macrostrat

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