Early Miocene (3)
Discoaster (12)
Sphenolithus (20)
Helicosphaera (14)
Description: Medium sized rosette-shaped discoasters with very large flaring boss on one side and 8-12 rays joined along most of their length with simple ray tips.
Remarks:
Range: NP11 to NP14.
Neogene: Discoaster
Paleogene: Discoaster kuepperi