Distinguishing features: Small to medium sized (height 4.0-9.4 µm) with short spine, narrow triangular shape (dart shaped). Lower quadrants are largest and the compound spine is dark at 0°.
Taxonomy:
Farinacci & Howe catalog pages: Sphenolithus spiniger *
Distinguishing features: Small to medium sized (height 4.0-9.4 µm) with short spine, narrow triangular shape (dart shaped). Lower quadrants are largest and the compound spine is dark at 0°.
Search data:Tags | LITHS: nannolith-radiate, N: 3D-radiate, conical, circular, PROCESS: length-fast, multicrystalline, spine, CSPH: not known, R-UNITS: all, lower-tier, spine, middle-tier, DETAILS: isogyres radial, |
Metrics | Lith size: 4->8µm; Sources: lith height from OD and illustrated specs |
Geological Range:
Notes: See comments below for discussion of LAD
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: Fornaciari et al, 2010
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985
Plot of occurrence data:
Bukry, D., (1971). Cenozoic calcareous nannofossils from the Pacific Ocean. San Diego Society of Natural History Transactions, 16: 303-327.GS Fornaciari, E.; Agnini, C.; Catanzariti, R.; Rio, D.; Bolla, E.M. & Valvasoni, E., (2010). Mid- Latitude calcareous nannofossil biostratigraphy and biochronology across the middle to late Eocene transition. Stratigraphy, 7(4): 229-264.GS Perch-Nielsen, K., (1985). Cenozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 427-555.GS
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Sphenolithus spiniger compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2019
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