Radiolithus hollandicus
Classification: Mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Radiolithus -> Radiolithus hollandicus
Sister taxa: R. laingii, R. hollandicus, R. orbiculatus, R. planus, R. undosus, R. sp.,
Distinguishing features: Radiolithus 10-16 wall-elements and low wall
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Taxonomy:
Citation: Radiolithus hollandicus Varol, 1992Rank: Species
Farinacci & Howe catalog pages: Radiolithus hollandicus * , ,
Distinguishing features: Radiolithus 10-16 wall-elements and low wall
Morphology remarks: 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)
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 UC1d (-Ma, top in "Holocene" 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:
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notesNote to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.Taxon plotted: Radiolithus hollandicus, synonyms included - Radiolithus hollandicus; space-time plot ::
Samples map :: Parent: Radiolithus
References:
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
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
Jeremiah, J. (2001). A Lower Cretaceous nannofossil zonation for the North Sea Basin. Journal of Micropalaeontology. 20: 45-80. gs
Varol, O. (1992b). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gs
