Type
Zone
Age range
217–214 Ma

International Timescale

Late Triassic
Norian

Ammonite Zonation - Boreal

Gnomohalorites cordilleranus
Mesohimavatites columbianus
Drepanites rutherfordi
217.0216.8216.6216.4216.2216.0215.8215.6215.4215.2215.0214.8214.6214.4214.2214.0

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