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Siphonodella quadruplicata-Patrognathus andersoni
634
Type
Zone
Age range
355–353
Ma
International Timescale
Mississippian
Tournaisian
Conodont Zonation
Gnathodus typicus-Siphonodella isosticha
Siphonodella quadruplicata-Patrognathus andersoni
Siphonodella sandbergi-Siphonodella belkai
355.0
354.9
354.8
354.7
354.6
354.5
354.4
354.3
354.2
354.1
354.0
353.9
353.8
353.7
353.6
353.5
353.4
353.3
353.2
353.1
353.0
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