Orastrum asarotum


Classification: Mesozoic -> Holococcoliths -> Common genera -> Orastrum -> Orastrum asarotum
Sister taxa: O. asarotum, O. campanensis, O. porosuturalis, O. perspicuum, O. robinsonii, O. colligatum, O. sp.,

Distinguishing features: Central plate of 4, high birefringence blocks - obliquely oriented; central pore. Medium sized (ca. 4-6 µm)


Taxonomy:

Citation: Orastrum asarotum Wind & Wise in Wise & Wind, 1977
Rank: Species

Farinacci & Howe catalog pages: Orastrum asarotum *

Distinguishing features: Central plate of 4, high birefringence blocks - obliquely oriented; central pore. Medium sized (ca. 4-6 µm)

Search data:
TagsLITHS: holococcolith, elliptical, CA: pores, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 4->6µm; Segments: 4->4;
Sources: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Maastrichtian Stage (66.04-72.05Ma, base in Maastrichtian stage). Data source: Burnett 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Orastrum asarotum, synonyms included - Orastrum asarotum;
  • space-time plot :: Samples map :: Parent: Orastrum

    References:

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

    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 :: view :: open

    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 :: view :: open


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    Orastrum asarotum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-6-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10822 Go to Archive.is to create a permanent copy of this page - citation notes



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