Type
Zone
Age range
327.2–325.5 Ma
Mississippian
Serpukhovian
Gnathodus postbilineatus
Gnathodus bollandensis
Lochriea cruciformis
327.2327.1327.0326.9326.8326.7326.6326.5326.4326.3326.2326.1326.0325.9325.8325.7325.6325.5