Distinguishing features:
Parent taxon (Bussonius): Elliptical watznaueriacean coccoliths with broad V-unit cycle, which results in a three tiered placolith structure. Moderately birefringent in XPL.
This taxon: Small (4-6µm) Bussonius with narrow shields and wide central area; distal shield elevated, 3-4 radial bars per quadrant.
Taxonomy:
Farinacci & Howe catalog pages: S. prinsi *
Distinguishing features:
Parent taxon (Bussonius): Elliptical watznaueriacean coccoliths with broad V-unit cycle, which results in a three tiered placolith structure. Moderately birefringent in XPL.
This taxon: Small (4-6µm) Bussonius with narrow shields and wide central area; distal shield elevated, 3-4 radial bars per quadrant.
Morphology:
LITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, grill, process, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 4->6µm; Data source notes: Bown 1987 |
Geological Range:
Last occurrence (top): in lower part of NJ8b subzone (30% up, 174.7Ma, in Aalenian stage). Data source: Bown & Cooper 1998 fig. 4 - secondary events
First occurrence (base): within NJ5a subzone (185.46-186.25Ma, base in Pliensbachian stage). Data source: Bown & Cooper 1998
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs Crux, J. A. (1987b). Early Jurassic calcareous nannofossil biostratigraphic events. Newsletters on Stratigraphy. 17: 79-100. gs Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Document des Laboratoires de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs O Menini, A., Mattioli, E., Spangenberg, J. E., Pittet, B. & Suan, G. (2018). New calcareous nannofossil and carbon isotope data for the Pliensbachian/Toarcian boundary (Early Jurassic) in the western Tethys and their paleoenvironmental implications. Newsletters on Stratigraphy. -. gs Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle, Paris. 75 [1972]: 95-156. gs References:
Bussonius prinsii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-9-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10148 Go to Archive.is to create a permanent copy of this page - citation notes |
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