Sphenolithus neoabies


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. moriformis group -> Sphenolithus neoabies
Sister taxa: S. abies, S. apoxis, S. bipedis, S. neoabies, S. moriformis, S. puniceus, S. grandis ⟩⟨ S. acervus, S. primus

Taxonomy:

Citation: Sphenolithus neoabies Bukry & Bramlette 1969
Rank: Species
Taxonomic discussion: There is no good evidence that separating small sphenoltith specimens from large ones is useful for either biostratigraphy or palaeocology and we do not reccommend use of this taxon. It is however fairly widely used, including in database records, so we include it here in the interests of objectivity.
Bergen et al. (2017) use the species but note that it has the same LAD as S. abies. They record an FAD in NN4 at Ceara Rise.

Distinguishing features: Like S. abies/moriformis but smaller, <4µm & base broad

Farinacci & Howe catalog pages: S. neoabies *


Size: Bukry & Bramlette proposed a size range of 2-4µm for S. neoabies, Backman proposed a size range of 2-3µm for S. compactus.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CROSS-POLARS: R-prominent,
MetricsLith size: 2->4µm;
Data source notes: lith height from ODs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: There have been suggestions that S. neoabies has a slightly higher top in the Pliocene than S. abies. 
Last occurrence (top): within NN15 zone (3.70-3.92Ma, top in Zanclean stage). Data source: commonly recorded up to last occurrence of the genus.
First occurrence (base): within NN4 zone (14.91-17.95Ma, base in Burdigalian stage). Data source: Bergen et al. (2017)

Plot of occurrence data:

References:

Backman, J. (1980). Miocene-Pliocene nannofossils and sedimentation rates in the Hatton-Rockall Basin, NE Atlantic Ocean. Stockholm Contributions in Geology. 36: 1-91. gs

Bergen, J. A., de Kaenel, E., Blair, S. A., Boesiger, T. M. & Browning, E. (2017). Oligocene-Pliocene taxonomy and stratigraphy of the genus Sphenolithus in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 77-112. gs V O

Bukry, D. & Bramlette, M. N. (1969b). Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology. 7: 131-142. gs V O


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Sphenolithus neoabies compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1306 Go to Archive.is to create a permanent copy of this page - citation notes



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