Nannotax3 - ntax_cenozoic - Rhomboaster bramlettei

Citation: Rhomboaster bramlettei (Brönnimann & Stradner, 1960) Bybell & Self-Trail, 1995

Basionym: Marthasterites bramlettei Brönnimann & Stradner, 1960

Synonyms:

Marthasterites nunnii Gartner 1971 - new name proposed since M. bramlettei was arguably a junior homonym of Marthasterites furcatus var. bramlettei. This became superfluous once Tribrachiatus was separated from Marthesterites.
Tribrachiatus nunnii (Gartner 1971) Romein 1979 [alternative name proposed owing to confusion over the validity of the original name - see van Heck 1980 INA Newsletter 2/1 p.33]
Tribrachiatus bramlettei (Bronnimann & Stradner, 1960) Proto Decima et al. 1975 [alternative combination, quite widely used]
Rhomboaster bitrifida Romein, 1979 [cf. Bybell & Self-Trail 1995]

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: Nannolith with the appearance of two symmetrically offset and superimposed tri-radiate cycles. Three-dimensional but flatter than Rhomboaster cuspis.

Geological Range:
Notes: Agnini et al. 2007 note that FCO occurs well within NP10 (ca. 30% up)
Last occurrence (top): near top of NP10 zone (90% up, 54.3Ma, in Ypresian stage). Data source: Agnini et al. 2007, fig. 9
First occurrence (base): at base of NP10 zone (0% up, 55.9Ma, in Ypresian stage). Data source: zonal marker (Perch-Nielsen 1985)

References:

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

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

Brönnimann, P. & Stradner, H. (1960). Die Foraminiferen- und Discoasteriden-zonen von Kuba und ihre interkontinentale Korrelation. Erdoel-Zeitschrift. 76(10): 364-369. gs

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. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. 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

Perch-Nielsen, K., Sadek, A., Barakat, M. G. & Teleb, F. (1978). Late Cretaceous and Early Tertiary Calcareous nannofossil and Planktonic foraminifera zones from Egypt. Actes du VI Colloque Africain de Micropaléontologie - Tunis 1974. Annales des Mines et de la Géologie Tunissienne. 28: 337-403. gs

Pospichal, J. J. & Wise, S. W. (1990). Paleocene to Middle Eocene calcareous nannofossils of ODP sites 689 and 690, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 613-638. gs

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs O

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs

Shafik, S. & Stradner, H. (1971). Nannofossils from the Eastern Desert, Egypt. Jahrbuch der Geologischen Bundesanstalt, Sonderband. 17: 69-104. gs

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 36(1): 33-59. gs O

Wei, W. & Zhong, S. (1996). Taxonomy and magnetobiochronology of Tribrachiatus and Rhomboaster, two genera of calcareous nannofossils. Journal of Paleontology. 70(1): 7-22. gs

Rhomboaster bramlettei

References:

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