Taxonomy:
Distinguishing features: Large, elevated Micrantholithus with deeply indented sides and gracile, long rays. The height of the pentalith results in a ragged LM appearance.
Farinacci & Howe catalog pages: Micrantholithus excelsus *
Search data:Tags | LITHS: nannolith-radiate, star-shaped, RIM: free-rays-long, CSPH: not known, T-UNITS: all, |
Metrics | Lith size: 9->18µm; Segments: 5->5; Liths per sphere: 12->12 Sources: lith size (diameter) from OD; lith numbers assumed from geometry |
Geological Range:
Last occurrence (top): within NP23 zone (29.62-32.02Ma, top in Rupelian stage). Data source: Bown 2005
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Bown 2005
Plot of occurrence data:
Bown, P. R. (2005d). 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 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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Micrantholithus excelsus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2019
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