Broinsonia cenomanica


Classification: Mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Broinsonia -> Broinsonia cenomanica
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: axial cross with lateral bars, supporting low spine


Taxonomy:

Citation: Broinsonia cenomanica (Black, 1973) Bown 2001
Rank: Species
Basionym: Acaenolithus cenomanicus Black, 1973
Variants: Acaenolithus undatus Black, 1973 - similar but with "one or two triangular expansions on either side of the long arms of the cross"
Acaenolithus vimineus Black, 1973 - similar but with robust grill in central area
Broinsonia dempta Forchheimer 1972 - with better developed spine, possibly a senior synonym
Notes & discussion: Similar to B. dentata but with a low central spine, and a disjunct range.

Farinacci & Howe catalog pages: Acaenolithus cenomanicus * , Acaenolithus undatus * , Acaenolithus vimineus * , Broinsonia dempta *

Distinguishing features: axial cross with lateral bars, supporting low spine

Geological Range:
Last occurrence (top): in lower part of UC3b subzone (20% up, 95.7Ma, in Cenomanian stage). Data source: Burnett 1998, fig. 6.2
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Burnett 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Broinsonia cenomanica, synonyms included - Acaenolithus cenomanicus; Broinsonia cenomanica; space-time plot :: Samples map :: Parent: Broinsonia

    References:

    Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. 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

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

    Forchheimer, S. (1972). Scanning electron microscope studies of Cretaceous coccoliths from the Köpingsberg Borehole No. 1, SE Sweden. Sveriges Geologiska Undersökning; Series C. #668, 65: 1-141. gs

    Lambert, B. (1993). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional (Deuxième Partie). Cahiers de Micropaleontologie. 8(2): 183-225. gs


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    Broinsonia cenomanica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10119 Go to Archive.is to create a permanent copy of this page - citation notes



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