Distinguishing features:
Parent taxon (Quadrum): Stellate to cubiform nannoliths with walls formed from two cycles of 4-9 elements and no central opening or diaphragm. When cubiform, the elements are joined along sutures that go out to the mid-point of the 'cube' edges.
This taxon: Like Q. gartneri but with a central depression and elements that appear to be thickened at the edges.
Taxonomy:
Farinacci & Howe catalog pages: Q. svabenickae *
Distinguishing features:
Parent taxon (Quadrum): Stellate to cubiform nannoliths with walls formed from two cycles of 4-9 elements and no central opening or diaphragm. When cubiform, the elements are joined along sutures that go out to the mid-point of the 'cube' edges.
This taxon: Like Q. gartneri but with a central depression and elements that appear to be thickened at the edges.
Morphology:
Size:
Tags | LITHS: nannolith-radiate, quadrate, CA: closed, CROSS-POLARS: T-prominent, |
Metrics | Lith size: 5->8µm; Segments: 4->4; Data source notes: illustrated specimens |
Geological Range:
Notes: FAD in UC15 in Tethyan realm (Burnett 1998)
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within Coniacian Stage (86.26-89.77Ma, base in Coniacian stage). Data source: Burnett 1998
Plot of occurrence data:
Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs O Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. 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 OReferences:
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Quadrum svabenickae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-8-2022
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10975 Go to Archive.is to create a permanent copy of this page - citation notes |
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