Type
Zone
Age range
252.4–251.902 Ma

International Timescale

Early Triassic
Induan
Lopingian
Changhsingian

Ammonite Zonation - Boreal

Ophiceras commune
upper Otoceras boreale
lower Otoceras boreale
252.42252.40252.38252.36252.34252.32252.30252.28252.26252.24252.22252.20252.18252.16252.14252.12252.10252.08252.06252.04252.02252.00251.98251.96251.94251.92251.90251.88

Macrostrat

Data

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