Early Miocene (3)
Discoaster (12)
Sphenolithus (20)
Helicosphaera (14)
Description: Elliptical Helicosphaera with relatively wide central area spanned by a broad, oblique disjunct bar.
Remarks:
Range: NP14 to NP23.
Neogene: Helicosphaera
Paleogene: Helicosphaera bramlettei