Type
Zone
Age range
129.4–129 Ma

International Timescale

Early Cretaceous
Hauterivian

Ammonite Zonation - Boreal

Haplocrioceras fissicostatum
Paracrioceras rarocinctum
Simbirskites variabilis
129.40129.38129.36129.34129.32129.30129.28129.26129.24129.22129.20129.18129.16129.14129.12129.10129.08129.06129.04129.02129.00

Macrostrat

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