Type
Zone
Age range
98.75–98.19 Ma

International Timescale

Late Cretaceous
Cenomanian

Ammonite Zonation - Western Interior

Neogastroplites maclearni
Neogastroplites americanus
Neogastroplites muelleri
98.7598.7098.6598.6098.5598.5098.4598.4098.3598.3098.2598.20

Macrostrat

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