Nannotax3 - ntax_mesozoic - Biscutum coronum

Distinguishing features: Large (>8µm) Biscutum with moderately narrow central area with clear non-birefringent axial structure and well-developed, bright, inner tube cycle.

Citation: Biscutum coronum Wind & Wise in Wise & Wind, 1977

Distinguishing features: Large (>8µm) Biscutum with moderately narrow central area with clear non-birefringent axial structure and well-developed, bright, inner tube cycle.

Geological Range:
Notes: LAD in Late Campanian, UC15d, in tethyan province (Burnett 1998)
Last occurrence (top): in mid part of UC18 zone (50% up, 70.6Ma, in Maastrichtian stage). Data source: Burnett 1998, fig 6.6
First occurrence (base): in upper part of UC9a subzone (60% up, 91.1Ma, in Turonian stage). Data source: Burnett 1998, fig.6.3

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997a). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43(281-302): -. 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

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs V O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs V O

Tags	LITHS: placolith, elliptical, CA: ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 7->10µm; Data source notes: holotype +/- 1µm & illustrated specimens

Biscutum coronum

References:

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