Type
Zone
Age range
251.902–251.9 Ma

International Timescale

Early Triassic
Induan
Lopingian
Changhsingian

Ammonite Zonation - Boreal

Ophiceras commune
upper Otoceras boreale
lower Otoceras boreale
251.9020251.9019251.9018251.9017251.9016251.9015251.9014251.9013251.9012251.9011251.9010251.9009251.9008251.9007251.9006251.9005251.9004251.9003251.9002251.9001251.9000

Macrostrat

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