Type
Zone
Age range
236.3–234.6 Ma

International Timescale

Late Triassic
Carnian

Ammonite Zonation - Boreal

Austrotrachyceras obesum
Tachyceras desatoyense
Daxatina canadensis
236.3236.2236.1236.0235.9235.8235.7235.6235.5235.4235.3235.2235.1235.0234.9234.8234.7234.6

Macrostrat

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