Type
Zone
Age range
92.08–91.6 Ma

International Timescale

Late Cretaceous
Turonian

Ammonite Zonation - Western Interior

Prionocyclus macombi
Prionocyclus hyatti
Collingnoniceras praecox
92.1092.0892.0692.0492.0292.0091.9891.9691.9491.9291.9091.8891.8691.8491.8291.8091.7891.7691.7491.7291.7091.6891.6691.6491.6291.6091.58

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