Type
Zone
Age range
217.5–217 Ma

International Timescale

Late Triassic
Norian

Ammonite Zonation - Boreal

Mesohimavatites columbianus
Drepanites rutherfordi
Juvavites magnus
217.52217.50217.48217.46217.44217.42217.40217.38217.36217.34217.32217.30217.28217.26217.24217.22217.20217.18217.16217.14217.12217.10217.08217.06217.04217.02217.00216.98

Macrostrat

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