Type
Zone
Age range
187.5–184.2 Ma

International Timescale

Early Jurassic
Toarcian
Pliensbachian

Ammonite Zonation - Boreal

Pleuroceras spinatum
Amaltheus margaritatus
Prodactylioceras davoei
187.6187.4187.2187.0186.8186.6186.4186.2186.0185.8185.6185.4185.2185.0184.8184.6184.4184.2

Macrostrat

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