Nannotax3 - ntax_cenozoic - Cruciplacolithus subrotundus

Citation: Cruciplacolithus subrotundus Perch-Nielsen, 1969

Distinguishing features: Circular to subcircular Cruciplacolithus with narrow central area and broad cross-bars.

Geological Range:
Last occurrence (top): in lower part of NP5 zone (25% up, 61Ma, in Selandian stage). Data source: Perch-Nielsen 1985, Varol, (1989, fig. 12.4)
First occurrence (base): within NP4 zone (61.51-63.25Ma, base in Danian stage). Data source: Perch-Nielsen 1985

References:

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

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. 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. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V O

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

Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series. 265-310. gs V O

Tags	LITHS: placolith, circular, CA: cross-axial, ca_disjunct, CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 4->8µm;

Cruciplacolithus subrotundus

References:

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