Seam between the calibration curves

[Armin Schmidt]

As an occasional user of OxCal I recently came across the following issue. Maybe people have already discussed this before, but I couldn't find anything.

The usual recommendation is to use IntCal13 for the northern hemisphere and SHCal13 for the southern hemisphere. But at the seam between these to hemispheres the two calibration curves do not match very well (as might be expected).

In our example we have a sample from Ecuador (R_Date("Beta-124719", 870, 100); 1.5 degree south) and the discrepancy is quite pronounced:
IntCal13: 979 to 1294 AD
SHCal13: 1018-1319 plus 1352-1385 AD

What is the best way to handle this? I could simply take the view that the sample location is 1.5 degrees south and hence it has to be SHCal13, but I find this somewhat unsatisfactory.

What is the recommendation in this case?
All comments appreciated.

Armin

-----------------------------------------------------------------
Dr. Armin Schmidt
GeodataWIZ: Geo Data + Visualisation
  www.GeodataWIZ.com
  www.GeodataWIZ.com/armin-schmidt
Chairman, Internat. Society for Archaeological Prospection
  www.archprospection.org
Honorary Visiting Research Fellow, University of Bradford
  School of Archaeological Sciences
Honorary Fellow, Durham University
  Department of Archaeology
http://orcid.org/0000-0002-4241-5381

Available in print:
  Earth Resistance for Archaeologists (2013). Lanham: AltaMira Press
  Geophysical Data in Archaeology (2013). Oxford: Oxbow Books.
http://www.amazon.co.uk/-/e/B0034QC4OW

[Rayfo...@aol.com]

Hi Armin,

 

Long time no hear!

 

There was an earlier extensive discussion on this, go to:

 

https://groups.google.com/forum/#!topic/oxcal/4iLXRpcDgcU

 

Near the end (30/9/2013) is Christopher's suggestion and a bit of code.

 

Best wishes

 

Ray Kidd

 

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[Erik]

Armin,

I agree with Ray. I use the code Christopher recommended for dates in Ecuador, which allows for both curves at the same time.

https://groups.google.com/forum/#!topic/oxcal/4iLXRpcDgcU

Erik