Type
Zone
Age range
249.3–248.55 Ma

International Timescale

Early Triassic
Olenekian

Ammonite Zonation - Boreal

Anawasatchites tardus
Euflemingites romunderi
Hedenstroemia hedenstroemi
249.3249.3249.2249.2249.1249.1249.0248.9248.9248.8248.8248.8248.7248.7248.6248.6

Macrostrat

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