Type
Zone
Age range
13.77–13.41 Ma
Miocene
Serravallian
F. fohsi TRZ
F. praefohsi LOZ
F. peripheroacuta LOZ
F. fohsi LOSZ
F. praefohsi LOZ
F. peripheroacuta LOZ
13.7813.7613.7413.7213.7013.6813.6613.6413.6213.6013.5813.5613.5413.5213.5013.4813.4613.4413.4213.40