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.
Burnett in Gale 1996 f5-10n.JPG
Jeremiah1996_pl2_fig9.JPG
Jeremiah1996_pl2_fig8.JPG
Burnett1998-6-11-04.jpg
Bown & Concheyro-2004_3-6.jpg
Bown & Concheyro-2004_3-7.jpg
Bown & Concheyro-2004_3-8.jpg
Bown_in_Gale2011 Fig54D.jpg
Bown_in_Gale2011 Fig54E.jpg
Lees 2007 pl10 46-47.jpg
Lees 2007 pl10 48-49.jpg
Lees 2007 pl10 50-51.jpg
Lees 2007 pl10 52-53.jpgTaxonomy:
Farinacci & Howe catalog pages: Calculites 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.
| Tags | LITHS: holococcolith, elliptical, CA: pores, closed, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic, |
| Metrics | Lith size: 3->5µm; Segments: 4->4; Sources: original description |
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:
Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. 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 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 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. gsReferences:
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Calculites percernis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-2-2020
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