R. reticulata group
Classification: ntax_cenozoic -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. reticulata group
Sister taxa: C. floridanus group, R. bisecta group, R. lockeri group, R. parvula group, R. pseudoumbilicus group, R. reticulata group, R. umbilicus group, R. sp.
Taxonomy:
Citation: R. reticulata groupRank: species groupTaxonomic discussion: Broadly, but not completely, correlates with the general usage of the genus Cribrocentrum Perch-Nielsen, 1971. This group includes the only strictly circular Paleogene reticulofenestrids but some smaller forms may have imperceptible (or lost) nets and there is some evidence of transitional subcircularity.
Distinguishing features: Typically circular reticulofenestrids with relatively narrow circular central area with robust grill (clearly visible in lm).
Farinacci & Howe catalog pages:
Ecology & Biogeography: This group is considered to be indicative of relatively warm water conditions (Bukry, 1973; Aubry, 1992a, b; Newsam et al., 2017, Jones & Dunkley Jones 2020)
Search data:
| Tags | LITHS: |
| Metrics | Lith size: 5->16µm; |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Notes: As defined this group is essentially restricted to the middle-upper Eocene.
Last occurrence (top): near top of Priabonian Stage (86% up, 34.4Ma, in Priabonian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Ypresian Stage (28% up, 53.7Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Reticulofenestra
References:
Aubry, M. -P. (1992a). Late Paleogene calcareous nannoplankton evolution: a tale of climatic deterioration. In, Prothero, D. R. & Berggren, W. A. (eds) Eocene-Oligocene Climatic and Biotic Evolution. Princeton University Press, Princeton 272-309. gs
Aubry, M-P. (1992b). Paleogene calcareous nannofossils from the Kerguelen Plateau, Leg 120. Proceedings of the Ocean Drilling Program, Scientific Results. 120: 471-491. gs V O
Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O
Bukry, D. (1973e). Low-latitude coccolith biostratigraphic zonation. Initial Reports of the Deep Sea Drilling Project. 15: 685-703. gs V O
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
Newsam, C., Bown, P. R., Wade, B. S. & Jones, H. L. (2017). Muted calcareous nannoplankton response at the Middle/Late Eocene Turnover event in the western North Atlantic Ocean. Newsletters on Stratigraphy. 50(3): 297-309. gs
