INA16 Athens - September 2017

Sphenolithus spiniger

Short diagnosis: Small to medium sized (height 4.0-9.4 µm) with short spine, narrow triangular shape (dart shaped). Lower quadrants are largest and the compound spine is dark at 0°.

Taxonomy:

Farinacci & Howe catalog pages: Sphenolithus spiniger *

Short diagnosis: Small to medium sized (height 4.0-9.4 µm) with short spine, narrow triangular shape (dart shaped). Lower quadrants are largest and the compound spine is dark at 0°.

Geological Range:
Notes: See comments below for discussion of LAD
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: Fornaciari et al, 2010
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985

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: Sphenolithus spiniger, synonyms included - Sphenolithus spiniger; Parent: S. radians group

Sphenolithus spiniger compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-8-2017 Taxon Search: Advanced Search AphiaID: not found Go to Archive.is to create a permanent copy of this page - citation notes

Comments (1)

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Alonso Rincon (Instituto Mexicano del Petróleo, Mexico)

Hello everyone. Some authors placed the extinction of S. spiniger in the biozone NP15 (Bown, 2005), but others authors in the biozone NP17 (Fornaciari et al, 2010; Shamrock 2010; Fensome, 2008; Toffanin et al, 2013. This can be attributed to the different geographical areas of studies? Greetings!!

7th May 2015 11:03pm

Jeremy Young (UCL, UK)

Hi Alonso
Interesting question - however a quick check of Bown 2005 (Tanzania paper) shows that he is quoting the occurrences observed in that area and that they had a gap in coverage from NP15 to mid NP17 so his data is not incompatible with a consistent LAD in NP17. I will adjust the nannotax entry following the reference you cite.
Jeremy

8th May 2015 5:34pm

Alonso Rincon (Instituto Mexicano del Petróleo, Mexico)

thank you very much for your comments, I found it very helpful. Alonso.

8th May 2015 6:23pm

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