Type
Zone
Age range
189.5–188.5 Ma

International Timescale

Early Jurassic
Pliensbachian

Ammonite Zonation - Boreal

Prodactylioceras davoei
Tragophylloceras ibex
Uptonia jamesoni
189.5189.4189.4189.3189.3189.3189.2189.2189.1189.1189.0188.9188.9188.8188.8188.8188.7188.7188.6188.6188.5

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