Type
Zone
Age range
229.7–227.3 Ma

International Timescale

Late Triassic
Norian
Carnian

Ammonite Zonation - Boreal

Stikinoceras kerri
Klamathites macrolobatus
Tropites welleri
229.8229.7229.6229.5229.4229.3229.2229.1229.0228.9228.8228.7228.6228.5228.4228.3228.2228.1228.0227.9227.8227.7227.6227.5227.4227.3227.2

Macrostrat

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