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Intervals
Macrostrat
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Clarkina asymmetrica
694
Type
Zone
Age range
258.5–257.7
Ma
International Timescale
Lopingian
Wuchiapingian
Conodont Zonation
Clarkina leveni
Clarkina asymmetrica
Clarkina dukouensis
258.5
258.4
258.4
258.4
258.3
258.3
258.2
258.1
258.1
258.1
258.0
257.9
257.9
257.9
257.8
257.8
257.7
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