Braloweria boletiformis


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Braloweria -> Braloweria boletiformis
Sister taxa: B. boletiformis, B. sp.

Distinguishing features: Loxoliths with central area filled with a tall, columnar to bulbous boss borne on a plate. Seen in side view. Spine has a thick wall, narrow axial canal and is formed from two crystallographically distinct units.


Taxonomy:

Citation: Braloweria boletiformis (Black, 1972) Crux, 1991
Rank: Species
Basionym: Parhabdolithus boletiformis Black, 1972

Farinacci & Howe catalog pages: P. boletiformis *

Distinguishing features: Loxoliths with central area filled with a tall, columnar to bulbous boss borne on a plate. Seen in side view. Spine has a thick wall, narrow axial canal and is formed from two crystallographically distinct units.


Morphology:

Search data:
TagsLITHS: murolith, elliptical, hollow, CA: ca_disjunct, plate, process, closed, CROSS-POLARS: rim-bicyclic, 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

See also: Percivalia bullata - another species with a very large bulbous spine;

Geological Range:
Last occurrence (top): at top of BC24 zone (100% up, 108.3Ma, in Albian stage). Data source: Bown et al. 1998 - zonal marker
First occurrence (base): within BC23 zone (110.06-111.91Ma, base in Albian stage). Data source: Bown et al. 1998

Plot of occurrence data:

References:

Black, M. (1972a). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48. gs

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

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

Crux, J. A. (1991a). Albian calcareous nannofossils from the Gault Clay of Munday’s Hill (Bedfordshire, England). Journal of Micropalaeontology. 10(203-221): -. gs V O

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 V O


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Braloweria boletiformis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10116 Go to Archive.is to create a permanent copy of this page - citation notes



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