Type
Zone
Age range
251.9–251.8 Ma

International Timescale

Early Triassic
Induan
Lopingian
Changhsingian

Ammonite Zonation - Boreal

Proptychites rosenkrantzi strigatus
Ophiceras commune
upper Otoceras boreale
lower Otoceras boreale
251.90251.90251.89251.88251.88251.88251.87251.87251.86251.85251.85251.84251.84251.84251.83251.82251.82251.81251.81251.81251.80

Macrostrat

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