Radiolithus orbiculatus


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

Distinguishing features: Radiolithus with 9 wall-elements and high wall.


Taxonomy:

Citation: Radiolithus orbiculatus (Forchheimer, 1972) Varol, 1992
Rank: Species
Basionym: Polycyclolithus orbiculatus Forchheimer, 1972

Farinacci & Howe catalog pages: Polycyclolithus orbiculatus *

Distinguishing features: Radiolithus with 9 wall-elements and high wall.


Morphology remarks: May be a variant of Eprolithus floralis.

Geological Range:
Last occurrence (top): within Turonian Stage (89.77-93.90Ma, top in Turonian stage). Data source: PRB nannotax entry
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian 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 notes
  • Note 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 orbiculatus, synonyms included - Eprolithus orbiculatus; Radiolithus orbiculatus; space-time plot :: Samples map :: Parent: Radiolithus

    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

    Forchheimer, S. (1972). Scanning electron microscope studies of Cretaceous coccoliths from the Köpingsberg Borehole No. 1, SE Sweden. Sveriges Geologiska Undersökning; Series C. #668, 65: 1-141. gs

    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

    Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs

    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 orbiculatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10979 Go to Archive.is to create a permanent copy of this page - citation notes



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