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Intervals
Macrostrat
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Polygnathus hemiansatus
613
Type
Zone
Age range
387.95–387.5
Ma
International Timescale
Middle Devonian
Givetian
Eifelian
Conodont Zonation
Polygnathus varcus
Polygnathus hemiansatus
Polygnathus ensensis
387.96
387.94
387.92
387.90
387.88
387.86
387.84
387.82
387.80
387.78
387.76
387.74
387.72
387.70
387.68
387.66
387.64
387.62
387.60
387.58
387.56
387.54
387.52
387.50
387.48
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