Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Rhomboaster Solid nannoliths that include rhombic, rhombic with spinose extensions and forms composed of two superimposed tri-radiate cycles. | |||||
Tribrachiatus Solid nannoliths with three rays that typically have terminal bifurcations. | Tribrachiatus contortus Tribrachiatus digitalis Tribrachiatus orthostylus Tribrachiatus absidatus Tribrachiatus lunatus Tribrachiatus sp. |
Taxonomy:
Distinguishing features:
Parent taxon (Nannolith families inc sed): Haptophytes forming calcareous structures not obviously homologous with heterococcoliths, holococcoliths, or discoasteralids
This taxon: Nannoliths with rhombic and tri-radiate morphologies, and non-birefringent images in XPL. Incorporating the genera Rhomboaster and Tribrachiatus.
Original description: Diagnosis: Nannoliths with rhombic and triradiate mor- phologies, and non-birefringent images in XPL. Incorporating the genera Rhomboaster and Tribrachiatus.
Farinacci & Howe catalog pages: Rhomboasteraceae
Morphology:
Lith size: 5->20µm; |
Geological Range:
Last occurrence (top): at top of NP12 zone (100% up, 50.5Ma, in Ypresian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Aubry, M. -P. (1996). Towards an Upper Paleocene-Lower Eocene high resolution stratigraphy based on calcarous nannofossil stratigraphy. Israel Journal of Earth Sciences. 44(239-253): -. gs Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. 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 Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs O von Salis, K., Monechi, S., Bybell, L. M., Self-Trail, J. & Young, J. R. (2000). Remarks on the calcareous nannofossil genera Rhomboaster and Tribrachiatus around the Paleocene/Eocene Boundary. GFF. 122(138-140): -. gsReferences:
Rhomboasteraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-11-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1207 Go to Archive.is to create a permanent copy of this page - citation notes |
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