Nannotax3 - ntax_mesozoic - Nannoconus elongatus

Citation: Nannoconus elongatus Brönnimann, 1955

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.

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

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

Tags	LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,
Metrics	Lith size: 10->18µm; Data source notes: range of sub-species

Nannoconus elongatus

References:

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