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Erymnoceras coronatum
829
Type
Zone
Age range
164.5–164.2
Ma
International Timescale
Middle Jurassic
Callovian
Ammonite Zonation - Boreal
Peltoceras athleta
Erymnoceras coronatum
Kosmoceras jason
164.50
164.48
164.46
164.44
164.42
164.40
164.38
164.36
164.34
164.32
164.30
164.28
164.26
164.24
164.22
164.20
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