I have just come across a very brief "Paper" which details a study conducted on a skull found in Idaho, U.S., which was dated by radiocarbon to an age of about 600-700 years BP and is therefore older than the arrival of Europeans (Columbus) to America. The startling finding is that: "Forensic Mitochondrial DNA Haplogroup R0a1a identified, although it is not associated with known Native American populations. Area where Haplogroup R0a1a originated is from the Arabian Peninsula or western Eurasia"  of course the authors find that rather difficult to explain so they added that: "Forensic mitochondrial DNA identified haplogroup R0a1a which originated on the Arabian Peninsula; this is not consistent with the rest of the data in the study. Future work will include. Additional trace element analysis from the bone to provide constraints to the duration of burial independent of C-14 dating. A secondary ancient DNA analysis to confirm or disprove the initial findings".
That is check if the skull is younger and therefore admixture with an Arabian could be more plausible or, the mtDNA was wrongly identified and therefore the skull is old and Amerindian.
The map shows where R0 hg is more prevalent: Middle East, Balkans, Horn of Africa and East AFrica....
I am interested in following up on their following studies.
Watkins, Jennifer K.; Alanko, Gordon A.; Blatt, Samantha H.; Bradbury, Cynthia A.; Kohn, Matthew J.; Lytle, Marion; Lacroix, Deborah; Taylor, Joanna; Dudgeon, John; Hazard, Rebecca E.; O’Leary-Jepsen, Erin; and Butt, Darryl P., "A Transdisciplinary Approach to Determining the Provenience of a Distorted, Pre-Columbian Skull Recovered in Rural Idaho" (2015). College of Engineering Presentations. Paper 5. http://scholarworks.boisestate.edu/eng_15/5
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