Type
Zone
Age range
176.4–175 Ma

International Timescale

Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Dumortieria levesquei
Grammoceras thouarsense
Haugia variabilis
176.4176.3176.2176.1176.0175.9175.8175.7175.6175.5175.4175.3175.2175.1175.0

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