Owenia dispar


Classification: Mesozoic -> Holococcoliths -> Common genera -> Owenia -> Owenia dispar
Sister taxa: O. dispar, O. hillii, O. partitum, O. sp.,

Distinguishing features: Holococcolith with narrow rim and central plate comprising four blocks, the largest two at either end and smaller two forming a transverse bridge.


Taxonomy:

Citation: Owenia dispar (Varol in Al-Rifaiy et al., 1990) Bown in Kennedy et al., 2000
Rank: Species
Basionym: Calculites dispar Varol in Al-Rifaiy et al., 1990
Synonyms: Isocrystallolithus dispar (Varol in Al-Rifaiy et al., 1990) Rawson & Jeremiah 2001

Farinacci & Howe catalog pages: Calculites dispar * , Calculites dispar *

Distinguishing features: Holococcolith with narrow rim and central plate comprising four blocks, the largest two at either end and smaller two forming a transverse bridge.


Morphology remarks: O. dispar may represent preservational conspecific morphotypes of O. partitum, in which the central area bridge structure has become overgrown, fusing the four separate blocks to form two larger blocks, giving the overall appearance of a four-blocked holococcolith.

Size: Length 3.8-5.0 µm, width 2.3-3.4 µm.

Geological Range:
Last occurrence (top): within Early Cenomanian Substage (96.24-100.50Ma, top in Cenomanian stage). Data source: Kennedy et al. 2000
First occurrence (base): within Late Aptian Substage (112.95-122.98Ma, base in Aptian stage). Data source: Kennedy et al. 2000

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: Owenia dispar, synonyms included - Owenia dispar;
  • space-time plot :: Samples map :: Parent: Owenia

    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

    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

    Jeremiah, J. (2001). A Lower Cretaceous nannofossil zonation for the North Sea Basin. Journal of Micropalaeontology. 20: 45-80. 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

    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

    Rawson, P. F. & Jeremiah, J. (2001). A Tethyan belemnite, Duvalia, and associated nannofossils from the Upper Barremian (Lower Cretaceous) of the Central North Sea. Proceedings of the Geologists' Association. 112(55-58): -. gs


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    Owenia dispar compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10841 Go to Archive.is to create a permanent copy of this page - citation notes



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