Type
Zone
Age range
202.2–201.4 Ma

International Timescale

Early Jurassic
Hettangian
Late Triassic
Rhaetian

Ammonite Zonation - Boreal

Psiloceras planorbis
Choristoceras crickmayi
Chochloceras amoenum
202.2202.2202.1202.1202.0201.9201.9201.8201.8201.8201.7201.7201.6201.6201.5201.4201.4

Macrostrat

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