Tubodiscus verenae


Classification: Mesozoic -> Podorhabdales -> Tubodiscaceae -> Tubodiscus -> Tubodiscus verenae
Sister taxa: T. bellii, T. burnettiae, T. frankiae, T. jurapelagicus, T. verenae, T. sp.

Distinguishing features: Large (8-16 µm) Tubodiscus with broad, high collar cycle that is highly birefringent (yellow-orange) in XPL; often seen in side view.


Taxonomy:

Citation: Tubodiscus verenae Thierstein, 1973
Rank: Species

Farinacci & Howe catalog pages: T. verenae + *

Distinguishing features: Large (8-16 µm) Tubodiscus with broad, high collar cycle that is highly birefringent (yellow-orange) in XPL; often seen in side view.


Morphology: Distinguished from all other tubodiscids by it high collar cycle. This species has only rarely been reported from boreal latitdues, but in tethyan sections it has been used biostratigraphically, since Thierstein (1973) reported that it was restricted to the Valanginian. Applegate and Bergen (1988), however, recorded this species rarely but consistently into the Upper Hauterivian of ODP Site 638.

Search data:
TagsLITHS: placolith, elliptical, cylindrical, hollow, CA: vacant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 8->16µm;
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): within Late Hauterivian Substage (130.77-133.09Ma, top in Hauterivian stage). Data source: Bown et al. 1998
First occurrence (base): within Late Berriasian Substage (139.39-141.93Ma, base in Berriasian stage). Data source: Bown et al. 1998

Plot of occurrence data:

References:

Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs V O

Bown, P. R. (1992). New calcareous nannofossil taxa from the Jurassic/Cretaceous boundary interval of Sites 765 and 261, Argo Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 123: 369-379. gs V O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs

Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs V O

Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs V O

Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs V O


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Tubodiscus verenae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-11-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11278 Go to Archive.is to create a permanent copy of this page - citation notes



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