Nannotax3 - ntax_mesozoic - Broinsonia viriosa Nannotax3 - ntax_mesozoic - Broinsonia viriosa

Broinsonia viriosa


Classification: ntax_mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Broinsonia -> Broinsonia viriosa
Sister taxa: B. parca, B. enormis, B. furtiva, B. gammation ⟩⟨ B. verecundia, B. dentata, B. cenomanica ⟩⟨ B. ethmoquadrata ⟩⟨ B. signata, B. galloisii, B. matalosa, B. viriosa, B. sp.

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: Large Broinsonia (>8 µm) with broad axial cross bars.


Taxonomy:

Citation: Broinsonia viriosa (Jeremiah, 1996) Bown in Kennedy et al., 2000
taxonomic rank: Species
Basionym: Acaenolithus viriosus Jeremiah, 1996

Farinacci & Howe catalog pages: A. viriosus *

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: Large Broinsonia (>8 µm) with broad axial cross bars.

Search data:
LITHS: placolith, elliptical, CA: cross-axial, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic,
Lith size: 8->11µm;
Data source notes: Bown in Kennedy et al. 2000
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Albian Substage (109.70-113.20Ma, top in Albian stage). Data source: Jeremiah 1996
First occurrence (base): in lower part of BC22 zone (30% up, 114.2Ma, in Aptian stage). Data source: Bown et al. 1998 (fig 5.2)

Plot of occurrence data:

References:

Bown, P. R. (2001). Calcareous nannofossils of the Gault, Upper Greensand and Glauconitic Marl (Middle Albian-Lower Cenomanian) from the BGS Selborne boreholes, Hampshire. Proceedings of the Geologists' Association. 112: 223-236. gs

Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs

Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs


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Broinsonia viriosa compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-11-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10134 Go to Archive.is to create a permanent copy of this page - citation notes
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