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Tortodus knockelianus knockelianus
611
Type
Zone
Age range
389.2–388
Ma
International Timescale
Middle Devonian
Givetian
Eifelian
Conodont Zonation
Polygnathus hemiansatus
Polygnathus ensensis
Tortodus knockelianus knockelianus
Polygnathus costatus costatus
389.3
389.2
389.1
389.1
389.1
389.0
388.9
388.9
388.9
388.8
388.8
388.7
388.6
388.6
388.6
388.5
388.4
388.4
388.4
388.3
388.3
388.2
388.1
388.1
388.1
388.0
387.9
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