Type
Zone
Age range
178.4–176.4 Ma

International Timescale

Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Grammoceras thouarsense
Haugia variabilis
Hildoceras bifrons
178.4178.3178.2178.1178.0177.9177.8177.7177.6177.5177.4177.3177.2177.1177.0176.9176.8176.7176.6176.5176.4

Macrostrat

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