INA16 Athens - September 2017

Helicosphaera compacta

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

Taxonomy:

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

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

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

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. Interpret with caution & read these notes
• Taxon plotted: Helicosphaera compacta, synonyms included - Helicopontosphaera compacta; Helicosphaera compacta; Parent: H. lophota group

Nannotax3 - Coccolithophores - Helicosphaera compacta by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-6-2017

Weblink to this page: ina.tmsoc.org/Nannotax3/link.php?taxon=Helicosphaera_compacta Cite this page - citation notes

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

15th October 2015 10:19am

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.

24th November 2015 7:51am

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