Nannotax3 - ntax_cenozoic - Blackites dupuisii

Citation: Blackites dupuisii (Steurbaut, 1990) Bown, 2005

Basionym: Naninfula dupuisii Steurbaut, 1990

Distinguishing features:
Parent taxon (B. clavus group): Spine conical, tapering with maximum width near base
This taxon: Spine tall, tapering, hollow; broad at its base but tapering and narrow in its upper half. Two or three spine-cycles are seen low on the spine, along with striated ornamentation. Spine height is usually 2-3x basal width.

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Steurbaut, 1990

References:

Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. 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 O

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

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

Steurbaut, E. (1990). Ypresian calcareous nannoplankton biostratigraphy and palaeogeography of the Belgian Basin. Bulletin de la Société Belge de Géologie. 97(1988): 251-285. gs

Steurbaut, E. (2011). New calcareous nannofossil taxa from the Ypresian (Early Eocene) of the North Sea Basin and the Turan Platform in West Kazakhstan. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique Sciences de la Terre. 81: 247-277. gs

Blackites dupuisii

References:

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Sub-taxa & variants (time control age-window is: 0-800Ma)
				Blackites cf. B. dupuisii Like B. dupuisii but the spine tapers uniformly from its wide base.