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Baculites reduncus
958
Type
Zone
Age range
78.34–77.63
Ma
International Timescale
Late Cretaceous
Campanian
Ammonite Zonation - Western Interior
Baculites scotti
Baculites reduncus
Baculites gregoryensis
78.3
78.3
78.3
78.2
78.2
78.1
78.0
78.0
78.0
77.9
77.8
77.8
77.8
77.7
77.7
77.6
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