Type
Zone
Age range
201.4–201.1 Ma

International Timescale

Early Jurassic
Hettangian
Late Triassic
Rhaetian

Ammonite Zonation - Boreal

Alsatites liasicus
Psiloceras planorbis
Choristoceras crickmayi
201.40201.38201.36201.34201.32201.30201.28201.26201.24201.22201.20201.18201.16201.14201.12201.10

Macrostrat

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