Type
Zone
Age range
170–169.8 Ma

International Timescale

Middle Jurassic
Bajocian

Ammonite Zonation - Boreal

Stephanoceras humphriesianum
Witchellia laeviuscula
Hyperlioceras discites
170.00169.99169.98169.97169.96169.95169.94169.93169.92169.91169.90169.89169.88169.87169.86169.85169.84169.83169.82169.81169.80

Macrostrat

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