Nannotax3 - ntax_mesozoic - Radiolithus hollandicus

Radiolithus hollandicus


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Radiolithus -> Radiolithus hollandicus
Sister taxa: R. laingii, R. hollandicus, R. orbiculatus, R. planus, R. undosus, R. sp.

Distinguishing features:
Parent taxon (Radiolithus): Near circular to stellate eprolithids with relatively narrow wall formed from 9-16 brick-like, wall-cycle elements surrounding a wide central area spanned by an amedian diaphragm. The wall is usually lower than those seen in Eprolithus.
This taxon: Radiolithus 10-16 wall-elements and low wall


Taxonomy:

Citation: Radiolithus hollandicus Varol, 1992
Rank: Species

Farinacci & Howe catalog pages: R. hollandicus *

Distinguishing features:
Parent taxon (Radiolithus): Near circular to stellate eprolithids with relatively narrow wall formed from 9-16 brick-like, wall-cycle elements surrounding a wide central area spanned by an amedian diaphragm. The wall is usually lower than those seen in Eprolithus.
This taxon: Radiolithus 10-16 wall-elements and low wall


Morphology:

Although the number of elements in each cycle of the wall varies between ten and sixteen, the specimens with ten to twelve elements are the most common. R. hollandicus is distinguished from R . laingii by having a low wall (< 4 µm) and much narrower wall elements which are weakly birefringent under cross-polarised light. (Varol 1992)

Size:

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: vacant, closed, CROSS-POLARS: T-prominent,
MetricsLith size: 5->8µm; Segments: 10->16;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Slightly variable stratigraphic ranges have been reported: Albian (Varol, 1992); upper Albian (Jeremiah, 1996, 2001); Aptian-Cenomanian (Bown et al., 1998; Burnett, 1998).
Last occurrence (top): within UC1c subzone (98.26-99.94Ma, top in Cenomanian stage). Data source: Burnett 1998
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: PRB nannotax entry

Plot of occurrence data:

References:

Bown, P. R. (2001). Calcareous nannofossils of the Gault, Upper Greensand and Glauconitic Marl (Middle Albian-Lower Cenomanian) from the BGS Selborne boreholes, Hampshire. Proceedings of the Geologists' Association. 112: 223-236. gs

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

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

Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs V O

Jeremiah, J. (2001). A Lower Cretaceous nannofossil zonation for the North Sea Basin. Journal of Micropalaeontology. 20(1): 45-80. gs V O

Varol, O. (1992b). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gs


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Radiolithus hollandicus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-5-2022

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