Early Miocene (3)
Discoaster (12)
Sphenolithus (20)
Helicosphaera (14)
Description: Medium sized rosette-shaped discoasters with 9-16 rays joined along most of their length with simple broad ray tips.
Remarks:
Range: NP7 to NP9.
Neogene: Discoaster
Paleogene: Discoaster mohleri