Calculites percernis


Classification: ntax_mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites percernis
Sister taxa: C. favosus ⟩⟨ C. anfractus, C. axosuturalis, C. obscurus, C. ovalis, C. rosalyniae, C. additus ⟩⟨ C. cenomanicus, C. cyclops, C. juliae, C. maghredaswampensis, C. paulus, C. percernis, C. proscissus, C. turonicus ⟩⟨ C. sarstedtensis, C. suturus, C. sp.

Distinguishing features: Small Calculites with four blocks divided along near axial sutures (extinction lines) at 0˚ and diagonal sutures (extinction lines) at 45˚ to the polarising directions.


Taxonomy:

Citation: Calculites percernis Jeremiah, 1996
Rank: Species
Taxonomic discussion: The coccolith was described as formed of "four blocks divided along near axial sutures (extinction lines) at 0˚ and diagonal sutures (extinction lines) at 45˚ to the polarising directions." This description implies a cocolith with continuous rim not one divided into blocks - as understood here.

Farinacci & Howe catalog pages: C. percernis *

Distinguishing features: Small Calculites with four blocks divided along near axial sutures (extinction lines) at 0˚ and diagonal sutures (extinction lines) at 45˚ to the polarising directions.


Size: Type length 3-5 microns.

Search data:
TagsLITHS: holococcolith, elliptical, CA: ca_disjunct, pores, closed, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 3->5µm; Segments: 4->4;
Data source notes: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NC10a subzone (100.45-103.13Ma, top in Cenomanian stage). Data source: Gale et al., 2011
First occurrence (base): within NC9b subzone (103.13-107.59Ma, base in Albian stage). Data source: Gale et al., 2011

Plot of occurrence data:

References:

Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. In, Villa, G., Lees, J. A. & Bown, P. R. (eds) Calcareous Nannofossil Palaeoecology and Palaeocenographic Reconstructions, Proceedings of the INA9 conference, Parma 2002. Marine Micropaleontology. 52(1-4): 51-84. gs

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

Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. 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

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

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs V O


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Calculites percernis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10175 Go to Archive.is to create a permanent copy of this page - citation notes



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