Type
Zone
Age range
132.3–129.4 Ma

International Timescale

Early Cretaceous
Hauterivian

Ammonite Zonation - Boreal

Paracrioceras rarocinctum
Simbirskites variabilis
Simbirskites marginatus
132.4132.2132.0131.8131.6131.4131.2131.0130.8130.6130.4130.2130.0129.8129.6129.4

Macrostrat

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