Type
Zone
Age range
197.8–196.4 Ma

International Timescale

Early Jurassic
Sinemurian

Ammonite Zonation - Boreal

Caenisites turneri
Arnioceras semicostatum
Arietites bucklandi
197.8197.7197.6197.5197.4197.3197.2197.1197.0196.9196.8196.7196.6196.5196.4

Macrostrat

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