Type
Zone
Age range
129.4–129 Ma
Early Cretaceous
Hauterivian
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