Distinguishing features: Medium sized, with narrow bicyclic rim (bright inner cycle, dark outer cycle) and wide central area.
Taxonomy:
Farinacci & Howe catalog pages: Syracosphaera lamina de Kaenel and Villa * Syracosphaera tanzanensis *
Distinguishing features: Medium sized, with narrow bicyclic rim (bright inner cycle, dark outer cycle) and wide central area.
Morphology remarks: Muroliths with a typical Syracosphaera structure, with a high rim, narrow radial lath cycle, broad central plate formed of fused elements and a central spine. The relatively thick and high rim produces the distinct bright cycle in XPL.
Tags | LITHS: murolith, elliptical, RIM: rim-narrow, CA: grill, PROCESS: low, spine, CSPH: not known, R-UNITS: rim, T-UNITS: c-str, DETAILS: ca_disjunct, rim-bicyclic, |
Metrics | Lith size: 4->6µm; Sources: lith length from OD & illustrated specimens |
Geological Range:
Last occurrence (top): within Early Miocene Sub-Epoch (15.97-23.03Ma, top in Burdigalian stage). Data source: de Kaenel & Villa 1996 (as S. lamina)
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Dunkley Jones et al., 2009
Plot of occurrence data:
Bown, P.R., (2005). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research, 27(1): 21-95.GS 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 Dunkley Jones, T.; Bown, P.R. & Pearson, P., (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology, 7(4): 359-411.GS
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Syracosphaera tanzanensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2019
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