Type
Zone
Age range
199.3–197.8 Ma

International Timescale

Early Jurassic
Sinemurian

Ammonite Zonation - Boreal

Arnioceras semicostatum
Arietites bucklandi
Schlotheimia angulata
199.3199.2199.1199.0198.9198.8198.7198.6198.5198.4198.3198.2198.1198.0197.9197.8

Macrostrat

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