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Clioscaphites choteauensis
943
Type
Zone
Age range
85.56–85.23
Ma
International Timescale
Late Cretaceous
Santonian
Ammonite Zonation - Western Interior
Desmoscaphites erdmanni
Clioscaphites choteauensis
Clioscaphites vermiformis
85.56
85.54
85.52
85.50
85.48
85.46
85.44
85.42
85.40
85.38
85.36
85.34
85.32
85.30
85.28
85.26
85.24
85.22
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