Type
Zone
Age range
171.3–170.9 Ma

International Timescale

Middle Jurassic
Bajocian
Aalenian

Ammonite Zonation - Boreal

Graphoceras concavum
Brasilia bradfordensis
Ludwigia murchisonae
171.30171.28171.26171.24171.22171.20171.18171.16171.14171.12171.10171.08171.06171.04171.02171.00170.98170.96170.94170.92170.90

Macrostrat

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