Type
Zone
Age range
196.4–195.4 Ma

International Timescale

Early Jurassic
Sinemurian

Ammonite Zonation - Boreal

Asteroceras obtusum
Caenisites turneri
Arnioceras semicostatum
196.4196.3196.3196.3196.2196.2196.1196.1196.0195.9195.9195.8195.8195.8195.7195.7195.6195.6195.5195.4195.4

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