Nannotax3 - ntax_cenozoic - Pontosphaera distincta

Citation: Pontosphaera distincta (Bramlette & Sullivan, 1961) Roth & Thierstein, 1972

Basionym: Discolithus distinctus Bramlette & Sullivan, 1961

Distinguishing features: Large thick coccolith (orange birefringence in XPL) with broad thickened rim/margin and a relatively thick narrow perforate central plate.

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP15b subzone (44.12-45.49Ma, base in Lutetian 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

Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs V O

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

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, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 10->16µm; Data source notes: lith size from OD & illustrated specimens

Pontosphaera distincta

References:

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