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Scaphites ventricosus
939
Type
Zone
Age range
89.77–88.77
Ma
International Timescale
Late Cretaceous
Coniacian
Turonian
Ammonite Zonation - Western Interior
Scaphites depressus
Scaphites ventricosus
Scaphites preventricosus
89.8
89.8
89.7
89.7
89.6
89.5
89.5
89.5
89.4
89.3
89.3
89.3
89.2
89.2
89.1
89.0
89.0
89.0
88.9
88.8
88.8
88.8
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