Taxonomy:
Distinguishing features: Two relatively thick cycles of similar diameter.
Farinacci & Howe catalog pages: H. aktasii *
Search data: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 |
Geological Range:
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:
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Heliolithus aktasii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-2-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=699 Go to Archive.is to create a permanent copy of this page - citation notes |