Taxonomy:
Distinguishing features:
Parent taxon (P. cretacea group): Elliptical Prediscophaera species with a diagonal cross
This taxon: Base like P. cretacea but spine very tall and thin; easy to recognise in side view
Farinacci & Howe catalog pages: P. microrhabdulina *
Search data:
LITHS: placolith, elliptical, CA: ca_disjunct, process, diagonal cross, CROSS-POLARS: rim-bicyclic, V-prominent, |
Lith size: 4->8µm; Segments: 16->16; Data source notes: guesstimate (base width) |
Geological Range:
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): near base of UC12 zone (10% up, 85.2Ma, in Santonian stage). Data source: Burnett 1998, fig 6.4
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 Perch-Nielsen, K. & Pomerol, C. (1973). Nannoplancton calcaire a la limite Cretace-Tertiaire dans le Bassin de Majunga (Madagascar). Comptes rendus hebdomaire de l'Académie des sciences, Paris. 276(17): 2435-2439. gs Perch-Nielsen, K. (1973). Neue Coccolithen aus dem Maastrichtien von Danemark, Madagaskar und Agypten. Bulletin of the Geological Society of Denmark. 22: 306-333. gs Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs References:
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Prediscosphaera microrhabdulina compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-5-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10938 Go to Archive.is to create a permanent copy of this page - citation notes |
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