Nannotax3 - ntax_cenozoic - Pontosphaera duocava

Citation: Pontosphaera duocava (Bramlette & Sullivan, 1961) Romein, 1979

Basionym: Discolithus duocavus Bramlette & Sullivan, 1961

Distinguishing features: Simple unadorned plate with two widely spaced longitudinally arranged holes; the rim is usually distinct from the plate in XPL, and can be relatively high.

Geological Range:
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: [PRB rough estimate]

References:

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs V O

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs V O

Tags	LITHS: murolith, elliptical, CA: ca_conjunct, pores, bar, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 8->12µm; Data source notes: lith size from OD & illustrated specimens

Pontosphaera duocava

References:

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