Helicosphaera compacta


Classification: Coccolithophores -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. lophota group -> Helicosphaera compacta
Sister taxa: H. clarissima, H. compacta, H. disrupta, H. reticulata, H. robinsoniae, H. bramlettei, H. lophota, H. papillata, H. prolixa, H. seminulum, H. wilcoxonii,

Taxonomy:

Citation: Helicosphaera compacta Bramlette & Wilcoxon, 1967
Rank: Species
Variants: Helicosphaera moorkensii Steurbaut, 1983 - closed central area (no pores) - NP23

Distinguishing features: Elliptical Helicosphaera with well defined birefringent blanket in XPL and narrow central area spanned by a conjunct bar.

Farinacci & Howe catalog pages: Helicosphaera compacta * , Helicosphaera moorkensii *

Search data:
TagsLITHS: placolith, asymmetric, RIM: wing, CA: bar-transverse,
CSPH: ellipsoidal, varimorphic, V-UNITS: distal shield, R-UNITS: blanket, c-str, px-plate, DETAILS: ca_conjunct, rim-bicyclic, isogyres kinked, isogyres oblique, isogyres separated,
MetricsLith size: 10->15µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP24 zone (26.84-29.62Ma, top in Chattian stage). Data source: de Kaenel & Villa, 1996; Boesiger et al 2017
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: [PRB rough estimate]

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: Helicosphaera compacta, synonyms included - Helicopontosphaera compacta; Helicosphaera compacta; space-time plot :: Samples map :: Parent: H. lophota group

    References:

    Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E. & Blair, S. A. , . (2017). Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. Journal of Nannoplankton Research. 37(2-3): 145-175. gs

    Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. 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

    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

    Bramlette, M. N. & Wilcoxon, J. A. (1967b). Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology. 5: 93-131. gs

    de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program. Scientific Results. 149: 79-145. gs

    Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

    Haq, B. U. (1973). Evolutionary trends in the Cenozoic coccolithophore genus Helicopontosphaera. Micropaleontology. 19(1): 32-52. gs

    Perch-Nielsen, K. (1971b). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter. Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

    Steurbaut, E. (1983). The stratigraphic position of the Lower Oligocene Yrieu Sainds (SW France, based on calcareous nannofossils and a new Helicosphaera species. Eclogae Geologicae Helvetiae. 76(2): 327-331. gs

    Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs

    Varol, O. (1998). Palaeogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 200-224. gs

    Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs

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    Helicosphaera compacta compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-8-2019

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    Comments (1)

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    Simon Cole (UK)
    Hi Jeremy
    I've always put the LO of H. compacta intra-NP24, approximated to the top of the Early Oligocene (28.09 according to GTS2012). I believe this is where de Kaenel & Villa, 1996 observed it too in most of their sections from the Iberia Abyssal Plain. Would you consider amending the absolute age here to reflect this?
    Cheers,
    Simon
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    Ines Galovic (Croatia)
    Maybe in IAP LO of the species marks the end of E. Oligocene, but in other Oceans (ODP, IODP and in other articles) its rare appearance certainly is in the Late Oligocene i.e. NP25, like in Adriatic (Mediterranean area)-mine observation.
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