Type
Zone
Age range
251.3–249.9 Ma

International Timescale

Early Triassic
Olenekian
Induan

Ammonite Zonation - Boreal

Hedenstroemia hedenstroemi
Vavilovites sverdrupi
Proptychites candidus
251.3251.2251.1251.0250.9250.8250.7250.6250.5250.4250.3250.2250.1250.0249.9

Macrostrat

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