Type
Zone
Age range
166.1–165.5 Ma

International Timescale

Middle Jurassic
Bathonian

Ammonite Zonation - Boreal

Prolanulites koenigi
Macrocephalites herveyi
Clydoniceras discus
166.10166.05166.00165.95165.90165.85165.80165.75165.70165.65165.60165.55165.50

Macrostrat

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