Sphenolithus ciperoensis


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. predistentus group -> Sphenolithus ciperoensis
Sister taxa: S. ciperoensis, S. distentus, S. predistentus ⟩⟨ S. patifunditus, S. bulbulus, S. tawfikii, S. celsus, S. peartiae, S. akropodus, S. tribulosus ⟩⟨ S. directus, S. avis, S. umbrellus, S. triangularis ⟩⟨ S. intercalaris, S. obtusus

Taxonomy:

Citation: Sphenolithus ciperoensis Bramlette and Wilcoxon, 1967
Rank: Species

Distinguishing features: Basal cycle relatively high. At 45° position isogyres separated and broadly curved (obtuse angle) 

Farinacci & Howe catalog pages: S. ciperoensis *


Morphology: Small with relatively large basal ‘feet’ (~half the height of the sphenolith and basal W/H <1.7) with low spine that typically appears monocrystalline, and at 45° a birefringent structure passes between the ‘feet’.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith size: 4->10µm;
Data source notes: lith height (excluding bifurcations) from illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: S. ciperoensis is the last of the S. distentus group of sphenliths so iti is a straightforwardevent to identify.
Last occurrence (top): in mid part of chron C7n.2n sub-Magnetochron (50% up, 24.3Ma, in Chattian stage). Data source: Raffi et al. 2006, fig. 5. Nb Marks the top of NP25
First occurrence (base): within NP24 zone (26.84-29.62Ma, base in Rupelian stage). Data source: zonal marker (see Perch-Nielsen 1985)

Plot of occurrence data:

References:

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

Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O

Bramlette, M. N. & Wilcoxon, J. A. (1967b). Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology. 5: 93-131. gs V O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O

Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O

Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V O

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O


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Sphenolithus ciperoensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2021

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