Type
Zone
Age range
170.9–170.3 Ma

International Timescale

Middle Jurassic
Bajocian
Aalenian

Ammonite Zonation - Boreal

Hyperlioceras discites
Graphoceras concavum
Brasilia bradfordensis
170.90170.85170.80170.75170.70170.65170.60170.55170.50170.45170.40170.35170.30

Macrostrat

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