Classification: ntax_cenozoic -> Discoasterales -> Heliolithaceae
Sister taxa: Discoasteraceae, Fasciculithaceae, Heliolithaceae, Sphenolithaceae

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Discoidal discoasteralids with a wide non-birefringent cycle and at least one narrower birefringent cycle, i.e., narrower than the diameter of the nannolith.

Discoidal discoasteralids with birefringent appearance.


Citation: Heliolithaceae Hay & Mohler, 1967
Rank: Family
Taxonomic discussion: Group of nannoliths closely allied to the discoasters, and probably transitional between typically VR heterococcolith morphology and the more derived, single crystal-unit form of Discoaster.

Distinguishing features: Discoidal discoasteralids with several distinct cycles including at least one that is birefringent.

Farinacci & Howe catalog pages: Heliolithaceae [no catalog entry yet]

Search data:
MetricsLith size: 5->18┬Ám;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at base of Ypresian Stage (1% up, 55.9Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Selandian Stage (4% up, 61.5Ma, in Selandian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Hay, W. W. & Mohler, H. P. (1967). Calcareous nannoplankton from Early Tertiary rocks at Point Labau, France and Paleocene-Early Eocene correlations. Journal of Paleontology. 41(6): 1505-1541. gs


Heliolithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-6-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=697 Go to Archive.is to create a permanent copy of this page - citation notes

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