Early Miocene (3)
Discoaster (12)
Sphenolithus (20)
Helicosphaera (14)
Description: Medium sized rosette-shaped discoasters with thickened central area and 20-26 rays joined along their length with simple, blunt ray tips.
Remarks:
Range: NP9 to NP10.
Neogene: Discoaster
Paleogene: Discoaster lenticularis