Type
Zone
Age range
182.7–180.7 Ma

International Timescale

Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Harpoceras falciferum
Dactylioceras tenuicostatum
Pleuroceras spinatum
182.7182.6182.5182.4182.3182.2182.1182.0181.9181.8181.7181.6181.5181.4181.3181.2181.1181.0180.9180.8180.7

Macrostrat

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