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Baculites gregoryensis
957
Type
Zone
Age range
79.01–78.34
Ma
International Timescale
Late Cretaceous
Campanian
Ammonite Zonation - Western Interior
Baculites reduncus
Baculites gregoryensis
Baculites perplexus
79.0
79.0
78.9
78.8
78.8
78.8
78.7
78.7
78.6
78.5
78.5
78.5
78.4
78.3
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