Type
Zone
Age range
214–205.7 Ma

International Timescale

Late Triassic
Rhaetian
Norian

Ammonite Zonation - Boreal

Chochloceras amoenum
Gnomohalorites cordilleranus
Mesohimavatites columbianus
214214213213212212211211210210209209208208207207206206

Macrostrat

Data

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