Distinguishing features: Unicyclic, small; bar divided longitudinally, darkest at 0°
Taxonomy:
Farinacci & Howe catalog pages: Z. blowii *
Distinguishing features: Unicyclic, small; bar divided longitudinally, darkest at 0°
Morphology: "A small species of Zeugrhabdotus with quite low birefringence that has a simple, disjunct bar composed of two elements. The bar is almost invisible at 0 ̊. At 45 ̊, the bar and rim have the same birefringence. Differentiation: This new species is distinguished from other zeugrhabdotids by the simplicity of its bar and by the way in which the bar goes into extinction at 0 ̊. The Jurassic Z. fissus is superficially similar to the new species, but has a bar with higher birefringence and a perforation in the centre of the bar that the new species lacks." [Lees 2007]
Size: Holotype dimensions: L = 3.52μm, W = 2.64μm
Tags | LITHS: murolith, ca_disjunct, process, bar, CROSS-POLARS: rim-unicyclic, V-prominent, |
Metrics | Lith size: 3->4µm; Data source notes: holotype +/-0.5µm |
Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Lees 2007 (original description)
Plot of occurrence data:
Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. 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 OReferences:
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Zeugrhabdotus blowii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-1-2021
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