Type
Zone
Age range
164.5–164.2 Ma

International Timescale

Middle Jurassic
Callovian

Ammonite Zonation - Boreal

Peltoceras athleta
Erymnoceras coronatum
Kosmoceras jason
164.50164.48164.46164.44164.42164.40164.38164.36164.34164.32164.30164.28164.26164.24164.22164.20

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