Orastrum perspicuum


Classification: ntax_mesozoic -> Holococcoliths -> Common genera -> Orastrum -> Orastrum perspicuum
Sister taxa: O. schollei ⟩⟨ O. asarotum, O. campanensis, O. porosuturalis ⟩⟨ O. perspicuum, O. robinsonii ⟩⟨ O. colligatum, O. sp.

Distinguishing features: Single, low birefringence, central plate with 1 or 2 perforations. Small (ca 3-5 µm)


Taxonomy:

Citation: Orastrum perspicuum Varol in Al-Rifaiy et al., 1990
Rank: Species

Farinacci & Howe catalog pages: O. perspicuum *

Distinguishing features: Single, low birefringence, central plate with 1 or 2 perforations. Small (ca 3-5 µm)

Search data:
TagsLITHS: holococcolith, elliptical, CA: ca_disjunct, pores, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
MetricsLith size: 3->5µm; Segments: 1->1;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: Burnett 1998
First occurrence (base): within NC7b subzone (112.95-122.25Ma, base in Aptian stage). Data source: Herrle & Mutterlose, 2003

Plot of occurrence data:

References:

Al-Rifaiy, I., Varol, O. & Lemone, D. (1990). Middle to late Albian biostratigraphy of the Cuchillo Formation from Sierra de Sapellò, Mexico. Newsletters on Stratigraphy. 21: 187-200. gs

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

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

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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Orastrum perspicuum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10825 Go to Archive.is to create a permanent copy of this page - citation notes



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