Type
Subzone
Age range
1.88–0.61 Ma
Pleistocene
Chibanian
Calabrian
Gelasian
G. truncatulinoides PRSZ
G. tosaensis HOSZ
G. fistulosus HOZ - Atlantic
1.91.81.71.61.51.41.31.21.11.00.90.80.70.6