Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
Heliolithus aktasii Two relatively thick cycles of similar diameter. | ||||
Heliolithus bukryi Heliolith with two birefringent cycles: a broad, thin cycle and a thin, much narrower cycle, around 1/3 of the width of the wider cycle. | ||||
Heliolithus cantabriae Heliolith with a broad, thin cycle and a taller, narrower cycle. The narrower cycle is over 3/4 of the width of the wider cycle. | ||||
![]() | Heliolithus kleinpellii Large, heliolith with two thin birefringent cycles. The narrow cycle is around 3/4 of the width of the wider cycle. | |||
Heliolithus knoxii Heliolith with two birefringent cycles: a broad, thin cycle and a tall, narrower cycle, around half of the width of the wider cycle. | ||||
Heliolithus riedelii Heliolith with two high, birefringent cycles, the narrower cycle is around two thirds of the width of the broader. | ||||
Heliolithus sp. Specimens which cannot be assigned to any established species |
Taxonomy:
Distinguishing features: Discoidal discoasteralids with birefringent appearance.
Farinacci & Howe catalog pages: Heliolithus *
Search data:Tags | LITHS: nannolith-radiate, circular, star-shaped, CROSS-POLARS: V-prominent, R-prominent, |
Metrics | Lith size: 6->18µm; |
Geological Range:
Last occurrence (top): in upper part of Thanetian Stage (70% up, 56.9Ma, in Thanetian 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:
Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gsReferences:
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Heliolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-1-2021
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=698 Go to Archive.is to create a permanent copy of this page - citation notes |