Type
Zone
Age range
238–237 Ma

International Timescale

Late Triassic
Carnian
Middle Triassic
Ladinian

Ammonite Zonation - Boreal

Daxatina canadensis
Frankites sutherlandi
Macl. maclearni
238.0237.9237.9237.8237.8237.8237.7237.7237.6237.6237.5237.4237.4237.3237.3237.3237.2237.2237.1237.1237.0

Macrostrat

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