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Baculites baculus
969
Type
Zone
Age range
72.2–71.2
Ma
International Timescale
Late Cretaceous
Maastrichtian
Campanian
Ammonite Zonation - Western Interior
Baculites grandis
Baculites baculus
Baculites eliasi
72.2
72.2
72.1
72.0
72.0
72.0
71.9
71.8
71.8
71.8
71.7
71.7
71.6
71.5
71.5
71.5
71.4
71.3
71.3
71.3
71.2
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