Type
Zone
Age range
172.2–171.3 Ma

International Timescale

Middle Jurassic
Aalenian

Ammonite Zonation - Boreal

Brasilia bradfordensis
Ludwigia murchisonae
Leioceras opalinum
172.2172.2172.1172.1172.0171.9171.9171.8171.8171.8171.7171.7171.6171.6171.5171.4171.4171.3171.3

Macrostrat

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