Early Miocene (3)
Discoaster (12)
Sphenolithus (20)
Helicosphaera (14)
Schematic cross-sections, from Young et al. (2003): white R-units, dark grey V-units, light grey cross-over zone, circles - locus of proto-coccolith ring
Image Galleries: Figures
Neogene: Zygodiscales
Imaging Technique: Drawing