Early Miocene (3)
Discoaster (12)
Sphenolithus (20)
Helicosphaera (14)
Description: Usually very large, stellate discoaster with 5 rays that have wide bifurcate ray tips.
Remarks:
Range: NP15 to NP16.
Neogene: Discoaster
Paleogene: Discoaster martinii