arrayname: original
Distinguishing features:
Parent taxon (P. spinosa group): Elliptical Prediscophaera species with an axial cross
This taxon: Small (3.5-5.5 µm); inner-rim cycle broad; thin axial cross
Taxonomy:
Farinacci & Howe catalog pages: P. borealensis *
Distinguishing features:
Parent taxon (P. spinosa group): Elliptical Prediscophaera species with an axial cross
This taxon: Small (3.5-5.5 µm); inner-rim cycle broad; thin axial cross
Size:
LITHS: placolith, elliptical, CA: cross-axial, process, ca_disjunct, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 3.5->5.5µm; Segments: 16->16; Data source notes: original description |
Geological Range:
Last occurrence (top): within UC19 zone (69.18-70.14Ma, top in Maastrichtian stage). Data source: Original descrpition
First occurrence (base): within UC16 zone (71.94-75.85Ma, base in Campanian stage). Data source: Original descrition
Plot of occurrence data:
Perez-Rodriguez, I., Lees, J. A., Larasoaña, J. C., Arz, J. A. & Arenillas, I. (2012). Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research. 37: 100-126. 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 borealensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10930 Go to Archive.is to create a permanent copy of this page - citation notes |
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