Type
Zone
Age range
170.3–170 Ma

International Timescale

Middle Jurassic
Bajocian

Ammonite Zonation - Boreal

Witchellia laeviuscula
Hyperlioceras discites
Graphoceras concavum
170.30170.28170.26170.24170.22170.20170.18170.16170.14170.12170.10170.08170.06170.04170.02170.00

Macrostrat

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