Type
Subzone
Age range
13.41–13.13 Ma
Miocene
Serravallian
F. robusta/F. fohsi CRSZ
F. fohsi LOSZ
F. praefohsi LOZ
13.4213.4013.3813.3613.3413.3213.3013.2813.2613.2413.2213.2013.1813.1613.1413.12