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Intervals
Macrostrat
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Clarkina transcaucasica
697
Type
Zone
Age range
256.5–255.3
Ma
International Timescale
Lopingian
Wuchiapingian
Conodont Zonation
Clarkina orientalis
Clarkina transcaucasica
Clarkina guangyuanensis
256.6
256.5
256.4
256.4
256.4
256.3
256.3
256.2
256.1
256.1
256.1
256.0
255.9
255.9
255.8
255.8
255.8
255.7
255.7
255.6
255.6
255.5
255.4
255.4
255.3
255.3
255.3
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