Classification: Coccolithophores -> Discoasterales -> Heliolithaceae -> Heliolithus -> Heliolithus aktasii
Sister taxa: H. aktasii, H. bukryi, H. cantabriae, H. kleinpellii, H. knoxii, H. riedelii, H. sp.,
Citation: Heliolithus aktasii Varol, 1989Rank: Species
Distinguishing features: Two relatively thick cycles of similar diameter.
Farinacci & Howe catalog pages: H. aktasii *
The morphological data given here can be used on the advanced search page. See also these notes
|Tags||LITHS: nannolith-radiate, circular, star-shaped, CROSS-POLARS: V-prominent, R-prominent, |
|Metrics||Lith size: 6->8µm; |
Data source notes: size from OD & slightly extended
Last occurrence (top): in lower part of NP9 zone (20% up, 56.9Ma, in Ypresian stage). Data source: Varol, (1989, fig. 12.4)
First occurrence (base): within NP5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Varol, 1989
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Heliolithus
Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series. 265-310. gs V O