Type
Zone
Age range
174.8–174.7 Ma

International Timescale

Middle Jurassic
Aalenian
Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Leioceras opalinum
Pleydellia aalensis
Dumortieria levesquei
174.80174.79174.79174.78174.78174.78174.77174.76174.76174.75174.75174.75174.74174.74174.73174.72174.72174.72174.71174.71174.70

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