Nannotax3 - ntax_cenozoic - Pontosphaera ocellata

Citation: Pontosphaera ocellata (Bramlette & Sullivan, 1961) Perch-Nielsen, 1984

Basionym: Discolithus ocellatus Bramlette & Sullivan, 1961

Synonyms:

Tranversopontis ocellata (Bramlette & Sullivan, 1961) Locker, in Pozaryska & Locker 1971

Variants:

Discolithina bicaveata Perch-Nielsen 1967 - similar but with better developed rim

Distinguishing features: Simple unadorned plate with two closely spaced, longitudinally arranged holes; the rim/margin is usually distinct from the plate in XPL, but not high.

Geological Range:
Last occurrence (top): within NP11 zone (53.70-54.17Ma, top in Ypresian 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

Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs V O

Perch-Nielsen, K. (1967b). Nannofossilien aus dem Eozan von Danemark. Eclogae Geologicae Helvetiae. 60: 19-32. 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

Perch-Nielsen, K. (1984b). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs V O

Pozaryska, K. & Locker, S. (1971). Les organismes planctoniques de l'Eocene superieur de Siemien, Pologne Orientale. Revue de Micropaléontologie. 14(5): 57-72. gs

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. 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 ocellata

References:

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