Type
Zone
Age range
93.35–92.9 Ma

International Timescale

Late Cretaceous
Turonian

Ammonite Zonation - Western Interior

Collingnoniceras praecox
Collingnoniceras woollgari
Mammites nodosoides
93.3693.3493.3293.3093.2893.2693.2493.2293.2093.1893.1693.1493.1293.1093.0893.0693.0493.0293.0092.9892.9692.9492.9292.9092.88

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