Type
Zone
Age range
237–236.3 Ma

International Timescale

Late Triassic
Carnian
Middle Triassic
Ladinian

Ammonite Zonation - Boreal

Tachyceras desatoyense
Daxatina canadensis
Frankites sutherlandi
237.0236.9236.9236.8236.8236.8236.7236.7236.6236.6236.5236.4236.4236.3236.3

Macrostrat

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