Citation: Blackites creber (Deflandre in Deflandre & Fert, 1954) Sherwood, 1974Taxonomic rank: speciesBasionym: Rhabdolithus creber Deflandre in Deflandre & Fert, 1954Taxonomic discussion: Similar to B. gladius but with a narrower spine that is near parallel for much of its length; the two species probably intergrade.
Distinguishing features: Parent taxon (B. inflatus group): Spine inflated with maximum width above base, many with conspicous bulge This taxon: Rhabdoliths with tall, narrow, hollow styliform spines, near parallel for much of their length, but that may broaden slightly in the upper half. The upper quarter of the spines display a distinctive striated pattern. The coccolith is relatively broad, and the spine usually less than half its width and may show a basal collar.
Lith size: 10->15µm; Data source notes: lith size (spine height) from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes
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 NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Bown 2005
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
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. gsO
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. gsO
Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs
Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gsO
Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs
Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs
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
Sherwood, R. W. (1974). Calcareous nannofossil systematics, palaeoecology and biostratigraphy of the Middle Eocene Weches Formation of Texas. Tulane Studies in Geology. 11: 1-79. gsO
Blackites creber compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-3-2025
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