Type
Zone
Age range
166.2–166.1 Ma

International Timescale

Middle Jurassic
Bathonian

Ammonite Zonation - Boreal

Macrocephalites herveyi
Clydoniceras discus
Oxycerites orbis
166.20166.19166.19166.19166.18166.18166.17166.16166.16166.16166.15166.15166.14166.13166.13166.13166.12166.12166.11166.10166.10

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