Type
Zone
Age range
93.45–93.35 Ma

International Timescale

Late Cretaceous
Turonian

Ammonite Zonation - Western Interior

Collingnoniceras woollgari
Mammites nodosoides
Vascoceras birchbyi
93.4593.4493.4493.4493.4393.4293.4293.4293.4193.4193.4093.3993.3993.3993.3893.3893.3793.3693.3693.3693.35

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