Flabellites oblongus


Classification: Mesozoic -> Podorhabdales -> Cretarhabdaceae -> Flabellites -> Flabellites oblongus
Sister taxa: F. oblongus, F. sp.,

Distinguishing features: Cretarhabdid with relatively narrow central-area spanned by blocky diagonal cross; outline may be asymmetric. Typically medium to large (6-10 µm), early forms smaller.


Taxonomy:

Citation: Flabellites oblongus (Bukry, 1969) Crux in Crux et al., 1982
Rank: Species
Basionym: Watznaueria oblonga Bukry, 1969
Synonyms: Flabellites biforaminis Thierstein, 1973

Farinacci & Howe catalog pages: Watznaueria oblonga * , Flabellites biforaminis *

Distinguishing features: Cretarhabdid with relatively narrow central-area spanned by blocky diagonal cross; outline may be asymmetric. Typically medium to large (6-10 µm), early forms smaller.


Morphology remarks: A significant size increase in this species is observed through the Aptian, with small sizes (3.5-5.0µm) recorded in the earliest Aptian (base Zone NC6) increasing to 7.0 µm at the top of Zone NC6, and reaching 10.0 µm by the early Albian (Zone NC8) (Bown, 2005).
One side of the distal shieldis often braoder than the other producing anasymmetric outline - this is nicely illustrated by Thiestein (1973). Possibly this reflects varimorphism on the coccosphere as seen in modern Helicosphaera.

Search data:
TagsLITHS: placolith, asymmetric, elliptical, CA: diagonal cross, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 6->9µm;
Sources: original descriptions & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in upper part of UC11b subzone (70% up, 86.4Ma, in Coniacian stage). Data source: Burnett 1998, fig. 6.4
First occurrence (base): within Late Barremian Substage (126.30-129.41Ma, base in Barremian stage). Data source: Bown et al. 1998

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: Flabellites oblongus, synonyms included - Flabellites biforaminis; Flabellites oblongus; Watznaueria oblonga;
  • space-time plot :: Samples map :: Parent: Flabellites

    References:

    Bown, P. R. (2001). Calcareous nannofossils of the Gault, Upper Greensand and Glauconitic Marl (Middle Albian-Lower Cenomanian) from the BGS Selborne boreholes, Hampshire. Proceedings of the Geologists' Association. 112: 223-236. gs :: ::

    Bown, P. R. (2005). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs :: view :: open

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs :: ::

    Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs :: ::

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. 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: 98-101. gs :: view :: open

    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. (2001). A Lower Cretaceous nannofossil zonation for the North Sea Basin. Journal of Micropalaeontology. 20: 45-80. gs :: view :: open

    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 :: ::

    Mutterlose, J. (1992). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs :: view :: open

    Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs :: view :: open

    Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs :: view :: open

    Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs :: view :: open


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    Flabellites oblongus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10452 Go to Archive.is to create a permanent copy of this page - citation notes



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