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Macrostrat
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Clarkina leveni
695
Type
Zone
Age range
257.7–257.2
Ma
International Timescale
Lopingian
Wuchiapingian
Conodont Zonation
Clarkina guangyuanensis
Clarkina leveni
Clarkina asymmetrica
257.72
257.70
257.68
257.66
257.64
257.62
257.60
257.58
257.56
257.54
257.52
257.50
257.48
257.46
257.44
257.42
257.40
257.38
257.36
257.34
257.32
257.30
257.28
257.26
257.24
257.22
257.20
257.18
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