Type
Zone
Age range
257.7–257.2 Ma

International Timescale

Lopingian
Wuchiapingian

Conodont Zonation

Clarkina guangyuanensis
Clarkina leveni
Clarkina asymmetrica
257.72257.70257.68257.66257.64257.62257.60257.58257.56257.54257.52257.50257.48257.46257.44257.42257.40257.38257.36257.34257.32257.30257.28257.26257.24257.22257.20257.18

Macrostrat

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