Taxonomy:
Distinguishing features: A small (typically <4 µm) Micrantholithus with raised ridges along the line of the segment sutures that give the appearance of a deeply indented pentalith. Many specimens, however, have thin calcite between the raised, birefringent areas.
Farinacci & Howe catalog pages: M. minimus *
Search data:Tags | LITHS: nannolith-radiate, pentagonal, star-shaped, CROSS-POLARS: T-prominent, |
Metrics | Lith size: 3->4µm; Segments: 5->5; Liths per sphere: 12->12 Data source notes: lith size (diameter) from OD; lith numbers assumed from geometry |
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 NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Dunkley Jones et al., 2009
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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Micrantholithus minimus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-4-2021
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