Nannotax3 - ntax_main - Nephrolithus frequens subsp. frequens

Citation: Nephrolithus frequens subsp. frequens Gorka 1957

Taxonomic discussion: Autonym introduced by Pospichal & Wise (1990) as a result of their description of N. frequens miniporus

Distinguishing features:
Parent taxon (Nephrolithus frequens): Central area with 2-15 perforations each surrounded by neat rings of rhombic elements
This taxon: Forms of N. frequens, with >2 holes in the central area (usually larger than N. frequens miniporus)

Geological Range:
Last occurrence (top): within Late Maastrichtian Substage (66.04-70.10Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): in mid part of UC15d subzone (50% up, 76.3Ma, in Campanian stage). Data source: Burnett 1998 (fig. 6.5) - but it is diachronous and later in most areas.

References:

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

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

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

Pospichal, J. J. & Bralower, T. J. (1992). Calcareous Nannofossils Across the Cretaceous/Tertiary Boundary, Site 761, Northwest Australian Margin. Proceedings of the Ocean Drilling Program, Scientific Results. 122: 735-752. gs

Pospichal, J. J. & Wise, S. W. (1990). 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

Pospichal, J. J. & Wise, S. W. (1990). 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

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

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

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

Nephrolithus frequens subsp. frequens

References:

Add Comment

Comments