Fasciculithus sp. Specimens which cannot be assigned to any established species
Taxonomy:
Citation: Fasciculithus Bramlette & Sullivan, 1961taxonomic rank: GenusType species: Fasciculithus involutus Bramlette & Sullivan, 1961.Taxonomic discussion: The subdivison into groups given here is based on Bown (2010).
Distinguishing features: Parent taxon (Fasciculithaceae): Conical or cylindrical discoasteralids consisting of 10-30 wedge-shaped, radially-arranged elements, in one to three superposed cycles. This taxon: Conical or cylindrical fasciculiths formed of a single cycle of elements, outer surface is usually covered by fenestrae.
Morphology: The c-axes are aligned radially in plan view but are inclined upward in side view. Hence the two halves of the nannolith show opposite extinction colours with a gypsum plate when vertical, with the left side blue in standard orientation (Romein 1979). Ths also means that in side view the nannolith does not go entirely into extinction in any position.
Search data:
LITHS: nannolith-radiate, circular, cylindrical,
Lith size: 4->20µm;
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Notes: Agnini et al. 2007 place top of Fasciculithus low (ca 20% up) in NP10 Last occurrence (top): at top of NP10 zone (100% up, 54.2Ma, in Ypresian stage). Data source: Total of ranges of the species in this database First occurrence (base): within NP4 zone (61.51-63.25Ma, base in Danian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007a). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs
Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs
Perch-Nielsen, K. (1985). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge (1): 427-555. gs
Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gsO
Steurbaut, E. & Sztrákos, K. (2008). Danian/Selandian boundary criteria and North Sea Basin–Tethys correlations based on calcareous nannofossil and foraminiferal trends in SW France. Marine Micropaleontology. 67: 1-29. gs
Fasciculithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-9-2024
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