Nannoconus steinmannii


Classification: ntax_mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. steinmannii group -> Nannoconus steinmannii
Sister taxa: N. bermudezii, N. dolomiticus, N. farinacciae, N. regularis, N. steinmannii

Distinguishing features: Pear-shaped to tapering


Daughter taxa: (blue => in age window 0-800Ma)
Nannoconus steinmannii subsp. minor
Squat (<10µm), tapering
Nannoconus steinmannii subsp. steinmannii
Tall (>10µm), pear-shaped to tapering

Taxonomy:

Citation: Nannoconus steinmannii Kamptner, 1931
Rank: Species
Basionym: Nannoconus steinmanni Kamptner, 1931

Farinacci & Howe catalog pages: N. steinmanni *

Distinguishing features: Pear-shaped to tapering


Morphology: 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.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,
MetricsLith size: 8->15µm;
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): 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. (2005c). 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 V O

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

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

Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs V O

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

Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs


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Nannoconus steinmannii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10776 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (2)

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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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