Type
Zone
Age range
325.5–323.4 Ma
Pennsylvanian
Bashkirian
Mississippian
Serpukhovian
Declinognathodus noduliferus
Gnathodus postbilineatus
Gnathodus bollandensis
325.5325.4325.3325.2325.1325.0324.9324.8324.7324.6324.5324.4324.3324.2324.1324.0323.9323.8323.7323.6323.5323.4