Taxonomy:
Distinguishing features: Holococcolith that in side-view comprises a low basal coccolith and a relatively tall, hollow spine that tapers to a point. Both coccolith and spine are birefringent and crystallographically continuous in XPL.
Farinacci & Howe catalog pages: O. sudis *
Search data:Tags | LITHS: holococcolith, elliptical, hollow, CA: process, CROSS-POLARS: V-prominent, |
Metrics | Lith size: 4->5µm; Data source notes: lith size (height & width similar) from OD & extended slightly |
Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Bown & Dunkley Jones, 2006
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Bown & Dunkley Jones, 2006
Plot of occurrence data:
Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs V O 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. gsReferences:
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Orthozygus sudis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
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