Helicolithus turonicus


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae -> Helicolithus -> Helicolithus turonicus
Sister taxa: H. anceps, H. trabeculatus, H. leckiei, H. tectufissus ⟩⟨ H. turonicus, H. varolii, H. compactus, H. blairiae, H. sp.

Distinguishing features: Large (>6µm) Helicolithus with axial cross bars. Longitudinal bar longer than transverse bar.


Taxonomy:

Citation: Helicolithus turonicus Varol & Girgis, 1994
Rank: Species
Synonyms: Helicolithus valhallensis Mortimer 1987 [invalid - the name was used in the paper but was not formally described or illustrated, hence it is a nomen nudum]

Farinacci & Howe catalog pages: H. turonicus *

Distinguishing features: Large (>6µm) Helicolithus with axial cross bars. Longitudinal bar longer than transverse bar.

Search data:
TagsLITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->8µm;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in upper part of UC9c subzone (60% up, 89.8Ma, in Turonian stage). Data source: Burnett 1998, fig. 6.4
First occurrence (base): in upper part of UC8a subzone (60% up, 92.6Ma, in Turonian stage). Data source: Burnett 1998, fig.6.3

Plot of occurrence data:

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs V O

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs

Mortimer, C. P. (1987). Upper Cretaceous Calcareous Nannofossil Biostratigraphy of the Southern Norwegian and Danish North Sea Area. Abhandlungen der Geologischen Bundesanstalt. 39: 143-175. gs V O

Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs V O

Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253. gs


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Helicolithus turonicus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-3-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10512 Go to Archive.is to create a permanent copy of this page - citation notes



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