Nannotax3 - ntax_cenozoic - Cruciplacolithus inseadus

Citation: Cruciplacolithus inseadus Perch-Nielsen, 1969

Synonyms: Cruciplectus inseadus (Perch-Nielsen 1969) Aubry in Aubry & Bord (2009). The new genus Cruciplectus was proposed for this genus on the basis of the distinctive central area structure.

Taxonomic discussion: Rarely if ever distinguished in LM. The central structure is identical in form to the Mesozoic species Sollasites lowei (Bukry, 1969), the Jurassic murolith coccoliths Vacherauvillius mirus Goy, 1981 and extant papposphaeraceans, indicating that this grill architecture occurs across distinct taxonomic groups.

Distinguishing features: Small to moderate Cruciplacolithus with narrow axial cross bars and additional bars that run parallel to the inner edge of the central area.

Geological Range:
Last occurrence (top): within Oligocene Epoch (23.03-33.89Ma, top in Chattian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: Perch-Nielsen 1985

References:

Aubry, M. -P. & Bord, D. (2009). Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In, Koeberl, C. & Montanari, A. (eds) The Late Eocene Earth—Hothouse, Icehouse, and Impacts. Geological Society of America, Special Papers. 452: 279-301. gs

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O

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 V O

Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V O

Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs V O

Perch-Nielsen, K. (1969a). Die Coccolithen einiger danischer Maastrichtien- und Danienlokalitaten. Dansk Geologisk Forening Meddelelser. 19: 51-68. gs

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs V O

Tags	LITHS: placolith, elliptical, CA: concentric-ring(s), cross-axial, ca_disjunct, CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 3->8µm;

Cruciplacolithus inseadus

References:

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