Type
Zone
Age range
180.4–178.4 Ma

International Timescale

Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Haugia variabilis
Hildoceras bifrons
Harpoceras falciferum
180.4180.3180.2180.1180.0179.9179.8179.7179.6179.5179.4179.3179.2179.1179.0178.9178.8178.7178.6178.5178.4

Macrostrat

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