Taxonomy:
Distinguishing features: 4- to 7-rayed very large (20-45µm) discoaster, with long, thin, tapering free rays (broadest at their mid-point) and small central area.
Farinacci & Howe catalog pages: D. okadai *
Search data:Tags | LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 20->45µm; Segments: 30->50; Data source notes: size from OD |
Geological Range:
Last occurrence (top): at top of NP8 zone (95% up, 57.3Ma, in Thanetian stage). Data source: Agnini et al. 2007, fig. 9
First occurrence (base): in upper part of NP8 zone (80% up, 57.5Ma, in Thanetian stage). Data source: Agnini et al. 2007, fig. 9
Plot of occurrence data:
Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007a). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs Bukry, D. (1981b). Pacific coast coccolith stratigraphy between Point Conception and Cabo Orientes, Deep Sea Drilling Project Leg 63. Initial Reports of the Deep Sea Drilling Project. 63: 445-471. gs V OReferences:
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Discoaster okadai compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
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