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Kosmoceras jason
828
Type
Zone
Age range
164.6–164.5
Ma
International Timescale
Middle Jurassic
Callovian
Ammonite Zonation - Boreal
Erymnoceras coronatum
Kosmoceras jason
Sigloceras calloviense
164.60
164.59
164.59
164.59
164.58
164.57
164.57
164.56
164.56
164.56
164.55
164.54
164.54
164.53
164.53
164.53
164.52
164.51
164.51
164.50
164.50
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