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Sigloceras calloviense
827
Type
Zone
Age range
165–164.6
Ma
International Timescale
Middle Jurassic
Callovian
Ammonite Zonation - Boreal
Kosmoceras jason
Sigloceras calloviense
Prolanulites koenigi
165.00
164.98
164.96
164.94
164.92
164.90
164.88
164.86
164.84
164.82
164.80
164.78
164.76
164.74
164.72
164.70
164.68
164.66
164.64
164.62
164.60
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