Type
Zone
Age range
248.55–248.5 Ma

International Timescale

Early Triassic
Olenekian

Ammonite Zonation - Boreal

Bajarunia eumphala
Anawasatchites tardus
Euflemingites romunderi
248.552248.550248.548248.546248.544248.542248.540248.538248.536248.534248.532248.530248.528248.526248.524248.522248.520248.518248.516248.514248.512248.510248.508248.506248.504248.502248.500248.498

Macrostrat

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