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: small (<6µm) elongate species with lozenge-like central body and lateral bars
Taxonomy:
Farinacci & Howe catalog pages: B. verecundia *
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: small (<6µm) elongate species with lozenge-like central body and lateral bars
Search data:
LITHS: placolith, elliptical, CA: cross-axial, grill, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 3->5µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Burnett 1998
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs 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 OReferences:
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Broinsonia verecundia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-12-2023
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10133 Go to Archive.is to create a permanent copy of this page - citation notes |
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