Type
Zone
Age range
180.7–180.4 Ma

International Timescale

Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Hildoceras bifrons
Harpoceras falciferum
Dactylioceras tenuicostatum
180.70180.68180.66180.64180.62180.60180.58180.56180.54180.52180.50180.48180.46180.44180.42180.40

Macrostrat

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