Type
Zone
Age range
256.5–255.3 Ma
Lopingian
Wuchiapingian
Clarkina orientalis
Clarkina transcaucasica
Clarkina guangyuanensis
256.6256.5256.4256.4256.4256.3256.3256.2256.1256.1256.1256.0255.9255.9255.8255.8255.8255.7255.7255.6255.6255.5255.4255.4255.3255.3255.3