Type
Zone
Age range
470.3–468.7 Ma
Middle Ordovician
Darriwilian
Dapingian
Histiodella altifrons
Microzarkodina flabellum/Tripodus laevus
Reutterodus andinus
470.3470.2470.1470.0469.9469.8469.7469.6469.5469.4469.3469.2469.1469.0468.9468.8468.7