Distinguishing features: Large (8-11 µm), irregular formed/asymmetric, central area very small, closed, proximal shield reduced.
Taxonomy:
Farinacci & Howe catalog pages: B. dissimilis *
Distinguishing features: Large (8-11 µm), irregular formed/asymmetric, central area very small, closed, proximal shield reduced.
Search data:Tags | LITHS: placolith, asymmetric, elliptical, CA: ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Metrics | Lith size: 8->11µm; Data source notes: original description & illustrated specimens |
Geological Range:
Notes: LAD earlier in austral province, UC15d (Burnett 1998). All the ilustrated examples in Wise & Wind (1977) are from the Maastrichtian or Campanian but they record as it as common in Late Albian (sites 327A & 330).
Last occurrence (top): in upper part of UC17 zone (80% up, 71.2Ma, in Maastrichtian stage). Data source: Burnett 1998, fig 6.6
First occurrence (base): within Late Albian Substage (100.50-107.59Ma, base in Albian stage). Data source: Wise & Wind 1977
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O 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 Wind, F. H. & Wise, S. W. (1983). Correlation of upper Campanian-lower Maestrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 551-563. 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 OReferences:
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Biscutum dissimilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2021
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