Taxonomy:
Distinguishing features: Medium sized, irregularly elliptical to polygonal holococcoliths, which are dark in XPL but have distinctly high relief in phase contrast. Central hole seen in LM is a perforate cover on the distal side.
Farinacci & Howe catalog pages: O. occultus *
Search data:Tags | LITHS: holococcolith, elliptical, hollow, CA: process, closed, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 3->6µm; Data source notes: lith size from illustrated specs |
Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Dunkley Jones et al., 2009
Plot of occurrence data:
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 Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs V OReferences:
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Orthozygus occultus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-4-2021
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