Distinguishing features:
Parent taxon (Triscutum): Three-shielded placoliths with a wide central-area spanned by a proximal net or grill.
This taxon: Large (8-9 µm) Triscutum with broad high distal shield and central area spanned by a perforate net.
Taxonomy:
Farinacci & Howe catalog pages: T. beaminsterensis *
Distinguishing features:
Parent taxon (Triscutum): Three-shielded placoliths with a wide central-area spanned by a proximal net or grill.
This taxon: Large (8-9 µm) Triscutum with broad high distal shield and central area spanned by a perforate net.
Search data:
LITHS: placolith, elliptical, hollow, cylindrical, CA: grill, ca_disjunct, CROSS-POLARS: R-prominent, |
Lith size: 8->9µm; Data source notes: illustrated specimens |
Geological Range:
Last occurrence (top): within Middle Oxfordian Substage (156.60-159.40Ma, top in Oxfordian stage). Data source: Bown & Cooper 1998
First occurrence (base): within Early Bathonian Substage (167.37-168.17Ma, base in Bathonian 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 Dockerill, H. J. (1987). Triscutum, a distinctive new coccolith from the Jurassic. Bulletin des Centres de Recherches Exploration-Production Elf-Aquitaine. 11: 127-131. gs References:
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Triscutum beaminsterensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-5-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11253 Go to Archive.is to create a permanent copy of this page - citation notes |
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