Nannoconus elongatus


Classification: ntax_mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. truitti group -> Nannoconus elongatus
Sister taxa: N. cornuta, N. donnatensis, N. elongatus, N. inconspicuus, N. longus, N. minutus, N. multicadus, N. planus, N. quadriangulus, N. quadricanalis, N. truittii

Distinguishing features: Tall and cylindrical (height ~2x width).


Daughter taxa (time control age-window is: 0-800Ma)
Nannoconus elongatus subsp. cylindrus

Nannoconus elongatus subsp. elongatus

Taxonomy:

Citation: Nannoconus elongatus Brönnimann, 1955
Rank: Species

Farinacci & Howe catalog pages: N. elongatus *

Distinguishing features: Tall and cylindrical (height ~2x width).


Morphology: Cylindrical nannoconids with wide central cavities, and walls formed from moderately high-angled (20-45 degrees), and moderately thick, cycles (0.5-1.0µm). The cavity is similar in width to that of the wall but is generally narrower than those of N. quadricanalis. The overall shape is more elongate than that of N. quadricanalis.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,
MetricsLith size: 10->18µm;
Data source notes: range of sub-species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Burnett 1998
First occurrence (base): within Barremian Stage (126.30-130.77Ma, base in Barremian stage). Data source: Burnett 1998

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

Brönnimann, P. (1955). Microfossils incertae sedis from the Upper Jurassic and Lower Cretaceous of Cuba. Micropaleontology. 1(28-51): -. 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

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


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Nannoconus elongatus 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=10742 Go to Archive.is to create a permanent copy of this page - citation notes



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