Taxonomy:
Distinguishing features: 5-7 (typically 6) rayed, simple, stellate discoasters with broad, tapering rays joined along 1/2 their length.
Farinacci & Howe catalog pages: D. backmanii *
See also: Discoaster brouweri–like preservational morphotypes ;
Search data:Tags | LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 7->15µm; Segments: 5->7; Data source notes: size from OD |
Geological Range:
Last occurrence (top): in lower part of NP9 zone (20% up, 56.9Ma, in Ypresian stage). Data source: Agnini et al., 2007, fig. 9
First occurrence (base): in mid part of NP8 zone (50% up, 58Ma, in Thanetian stage). Data source: Agnini et al., 2006, 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 Agnini, C., Fornaciari, E. & Raffi, I. (2008). Three new species of calcareous nannofossil from Late Palaeocene and Early Eocene assemblages (Ocean Drilling Program Site 1262, Walvis Ridge, SE Atlantic Ocean). Journal of Nannoplankton Research. 30(1): 51-56. gs V O Monechi, S. (1985). Campanian to Pleistocene calcareous nannofossil stratigraphy from the Northwest Pacific Ocean, Deep Sea Drilling Project Leg 86. Initial Reports of the Deep Sea Drilling Project. 86: 301-336. gs V O Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V OReferences:
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Discoaster backmanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
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