Nephrolithus frequens subsp. frequens


Classification: ntax_mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Nephrolithus -> Nephrolithus frequens -> Nephrolithus frequens subsp. frequens
Sister taxa: N. frequens subsp. frequens, N. frequens subsp. miniporus

Distinguishing features: Forms of N. frequens, with >2 holes in the central area (usually larger than N. frequens miniporus)


Taxonomy:

Citation: Nephrolithus frequens subsp. frequens Górka 1957
Rank: Sub-species
Taxonomic discussion: Autonym introduced by Pospichal & Wise (1990) as a result of their description of N. frequens miniporus

Farinacci & Howe catalog pages:

Distinguishing features: Forms of N. frequens, with >2 holes in the central area (usually larger than N. frequens miniporus)

Search data:
TagsLITHS: placolith, asymmetric, CA: ca_disjunct, plate, pores, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 6->8µm;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Late Maastrichtian Substage (66.04-69.91Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): in mid part of UC15d subzone (50% up, 76.4Ma, in Campanian stage). Data source: Burnett 1998 (fig. 6.5) - but it is diachronous and later in most areas.

Plot of occurrence data:

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs V O

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Górka, H. (1957). Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284. gs V O

Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs V O

Pospichal, J. J. & Wise, S. W. (1990a). Calcareous nannofossils across the K/T boundary, ODP hole 690C, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 515-532. gs V O

Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs V O

Watkins, D. K. (1992). Upper Cretaceous nannofossils from Leg 120, Kergeulen Plateau, Southern Ocean. Proceedings of the Ocean Drilling Program, Scientific Results. 120: 343-370. gs V O

Wind, F. H. (1983). The genus Nephrolithus Górka, 1957 (Coccolithophoridae). Journal of Paleontology. 57: 157-161. gs


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Nephrolithus frequens subsp. frequens compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10799 Go to Archive.is to create a permanent copy of this page - citation notes



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