Biscutum coronum


Classification: ntax_mesozoic -> Podorhabdales -> Biscutaceae -> Biscutum -> Biscutum coronum
Sister taxa: B. constans, B. ellipticum ⟩⟨ B. coronum, B. dekaenelii, B. magnum, B. melaniae ⟩⟨ B. arrogans, B. asymmetricum, B. boletum, B. dissimilis, B. zulloii ⟩⟨ B. hattneri, B. notaculum, B. virginica ⟩⟨ B. gaultensis, B. thurowii ⟩⟨ B. davyi, B. depravatum, B. dorsetensis, B. dubium, B. erismatum, B. grande, B. intermedium, B. planum, B. profundum, B. sp.

Distinguishing features: Large (>8µm) Biscutum with moderately narrow central area with clear non-birefringent axial structure and well-developed, bright, inner tube cycle. 


Taxonomy:

Citation: Biscutum coronum Wind & Wise in Wise & Wind, 1977
Rank: Species

Farinacci & Howe catalog pages: B. coronum *

Distinguishing features: Large (>8µm) Biscutum with moderately narrow central area with clear non-birefringent axial structure and well-developed, bright, inner tube cycle. 

Search data:
TagsLITHS: placolith, elliptical, CA: ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 7->10µm;
Data source notes: holotype +/- 1µm & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: LAD in Late Campanian, UC15d, in tethyan province (Burnett 1998)
Last occurrence (top): in mid part of UC18 zone (50% up, 70.6Ma, in Maastrichtian stage). Data source: Burnett 1998, fig 6.6
First occurrence (base): in upper part of UC9a subzone (60% up, 91.1Ma, in Turonian stage). Data source: Burnett 1998, fig.6.3

Plot of occurrence data:

References:

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

Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997a). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43(281-302): -. gs

Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs V O

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs V O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs V O


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Biscutum coronum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10072 Go to Archive.is to create a permanent copy of this page - citation notes



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