Taxonomy:
Distinguishing features:
Parent taxon (Rhomboaster): Solid nannoliths that include rhombic, rhombic with spinose extensions and forms composed of two superimposed tri-radiate cycles.
This taxon: Rhombic Rhomboaster nannoliths with long, thin extensions from the points of the rhomb.
Farinacci & Howe catalog pages: R. calcitrapa * , M. spineus *
Search data:
LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: V-prominent, 1ou, |
Lith size: 10->20µm; Segments: 6->6; Data source notes: lith size from illustrated specimens |
Geological Range:
Last occurrence (top): near base of NP10 zone (5% up, 55.8Ma, in Ypresian stage). Data source: same range given as for R. cuspis
First occurrence (base): at top of NP9 zone (95% up, 55.9Ma, in Ypresian stage). Data source: same range given as for R. cuspis
Plot of occurrence data:
Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs O Bybell, L. M. & Self-Trail, J. (1995). Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. U.S. Geological Survey, Professional Paper. 1554: 1-36. gs O Bybell, L. & Self-Trail, J. (1997). Late Paleocene and Early Eocene calcareous nannofossils from three boreholes in an onshore-offshore transect from New Jersey to the Atlantic continental rise. Proceedings of the Ocean Drilling Program, Scientific Results. 150: 91-110. gs O Gartner, S. (1971). Calcareous nannofossils from the JOIDES Blake Plateau cores and revision of the Paleogene nannofossil zonation. Tulane Studies in Geology and Paleontology. 8: 101-121. gs O 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 Salomon, R. (1999). The Calcite Palace. Website - https://ina.tmsoc.org/galleries/CalcitePalace/index.htm. -. gsReferences:
Rhomboaster calcitrapa compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1204 Go to Archive.is to create a permanent copy of this page - citation notes |
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