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Macrostrat
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Polygnathus costatus costatus
610
Type
Zone
Age range
391.5–389.2
Ma
International Timescale
Middle Devonian
Eifelian
Conodont Zonation
Tortodus knockelianus knockelianus
Polygnathus costatus costatus
Polygnathus costatus partitus
391.6
391.5
391.4
391.3
391.2
391.1
391.0
390.9
390.8
390.7
390.6
390.5
390.4
390.3
390.2
390.1
390.0
389.9
389.8
389.7
389.6
389.5
389.4
389.3
389.2
389.1
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