Nannoconus steinmannii


Ancestry: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. steinmannii group -> Nannoconus steinmannii
Sister taxa: N. bermudezii, N. colomii, N. dolomiticus, N. farinacciae, N. regularis, N. steinmannii,

Short diagnosis: Pear-shaped to tapering


Daughter taxa (blue => in age window 0-300Ma)
Squat (<10µm), tapering
Tall (>10µm), pear-shaped to tapering

Taxonomy:

Citation: Nannoconus steinmanniiKamptner, 1931
Rank: Species
Basionym: Nannoconus steinmanniKamptner, 1931

Farinacci & Howe catalog pages: Nannoconus steinmanni *

Short diagnosis: Pear-shaped to tapering


Morphology remarks: Tapering, pear-shaped nannoconids with narrow central openings (canals) and walls formed from low-angled (<20 degrees), narrow cycles (<0.5µm). The width of the central opening is best judged using PC illumination.

Geological Range:
Last occurrence (top): in lower part of NC6b subzone (30% up, 125.3Ma, in Aptian stage). Data source: Bown et al. 1998, fig. 5.2
First occurrence (base): within Early Berriasian Substage (143.57-145.01Ma, base in Berriasian stage). Data source: Bown et al. 1998

Plot of occurrence data:

References:

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

Kamptner, E., (1931). Nannoconus steinmanni novo gen., novo spec., ein merkwurdiges gesteinbildendes Mikrofossil aus dem jungeren Mesozoikum der Alpen. Paläontologische Zeitschrift, 13: 288-298.


Nannotax3 - Mesozoic - Nannoconus steinmannii by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-4-2017

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Elliott Burden (Memorial University of Newfoundland, Canada)
I am looking for a contact that may help locate an old 1970's vintage coccolith sample perhaps housed/curated at Elf or Total in France. Basic questioning of my few contacts in the Calgary oil patch have not lead me to any French contacts.
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maryam (Iran)
Thank you very much for very good information and Description of jurassic samples , nannofossils of lower cretaceous.Yours sincerely "maryam".
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Jeremy Young (UCL, UK)
Thanks - it is good to hear you find the site useful
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