Nannoconus elongatus


Classification: 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: (blue => in age window 0-800Ma)
Nannoconus elongatus subsp. cylindrus

Nannoconus elongatus subsp. elongatus

Taxonomy:

Citation: Nannoconus elongatus Brönnimann, 1955
Rank: Species

Farinacci & Howe catalog pages: Nannoconus elongatus *

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


Morphology remarks: 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.

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:

  • 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: Nannoconus elongatus, synonyms included - Nannoconus elongatus;
  • space-time plot :: Samples map :: Parent: N. truitti group

    References:

    Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. 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

    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

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    Nannoconus elongatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-1-2020

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