Type
Zone
Age range
174.7–172.2 Ma

International Timescale

Middle Jurassic
Aalenian
Early Jurassic
Toarcian

Ammonite Zonation - Boreal

Ludwigia murchisonae
Leioceras opalinum
Pleydellia aalensis
Dumortieria levesquei
174.8174.6174.4174.2174.0173.8173.6173.4173.2173.0172.8172.6172.4172.2

Macrostrat

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