Type
Zone
Age range
200.2–199.3 Ma

International Timescale

Early Jurassic
Sinemurian
Hettangian

Ammonite Zonation - Boreal

Arietites bucklandi
Schlotheimia angulata
Alsatites liasicus
200.2200.2200.1200.1200.0199.9199.9199.8199.8199.8199.7199.7199.6199.6199.5199.4199.4199.3199.3

Macrostrat

Data

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