Type
Zone
Age range
296.5–295 Ma
Cisuralian
Asselian
Sweetognathus merrilli-Mesogondolella uralensis
Streptognathodus postfusus
Streptognathodus fusus
296.5296.4296.3296.2296.1296.0295.9295.8295.7295.6295.5295.4295.3295.2295.1295.0