Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Medium-sized with a complex axial-cross
Taxonomy:
Farinacci & Howe catalog pages: R. plebeius *
Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Medium-sized with a complex axial-cross
Search data:
LITHS: murolith, elliptical, CA: cross-axial, CROSS-POLARS: R-prominent, rim-unicyclic, |
Lith size: 5->8µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Burnett 1998
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs Crux, J. A., Hamilton, G. B., Lord, A. R. & Taylor, R. J. (1982). Tortolithus gen. nov. Crux and new combinations of Mesozoic calcareous nannofossils from England. INA Newsletter. 4(2): 98-101. gs Perch-Nielsen, K. (1968). Der Feinbau und die Klassifikation der Coccolithen aus dem Maastrichtien von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 16: 1-96. gs Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs References:
Rhagodiscus plebeius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11027 Go to Archive.is to create a permanent copy of this page - citation notes |
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