MANSONs of Caithness anyone?

Have had another great find from DNA testing this week.
Although I do suspect that at least part of it was under my nose, un-analysed from a while ago.

One of my larger matches on 23andme shared genomes, ie we can now see the details of where we match.
Turned out to be at a spot I already knew about two other, smaller, matches and had got as far as determining that we shared some unknown ancestor back up my father's side somewhere.
Needle in haystack.
But the haystack has just got quite a lot smaller.
It is looking far more likely to be my Caithness ancestral lines.

Although none of these matches were on GEDMatch where we could compare across all three companies, one had helpfully tested on both 23andme and on FamilyTreeDNA.
Where I could see that he matched not only myself, but also the late David FINLAYSON, and David's 1C1R who shares his James COGHILL and Isabella WATERS (married 1873 Dunnet, Caithness) as their most recent common ancestors.

But did I also match David there? Not according to FamilyTreeDNA.

Back to the wonderful GEDMatch to see if there was a match below the matching thresholds FTDNA apply. Yes, just below the FTDNA threshold, two segments, totalling 17cM in all, one right where I wanted it to be.

I don't, to my knowledge, have any known COGHILL or WATERS direct ancestry, but we all do have MANSON families - who doesn't if your ancestors come from Caithness? Not that I can see any immediate connection, but somewhere, somewhen, there is a common ancestor who gave us that shared bit of dna on chromosome 13.

My known MANSON ancestry is more from Watten, tiny bit further south than Olrig/Dunnet etc.

Love to hear from anyone with any of the above MANSONs in their ancestry, particularly if you've ventured into DNA testing for genealogy so we can share research and genetics, and hopefully begin to pinpoint which family lines are involved.

Pity that it didn't show up as David's paternal side as we had always considered that our FINLAYSONs just might be related, just back from the beginning of parish records in Bower.
Looks to be a bit far for atDNA to prove, even with the inter-related Caithness families ensuring dna survival beyond the normal expected inheritance probabilities down the generations.

My RootsWeb WorldConnect database LornaHenderson will be updated shortly to include the relevant bits of the above pedigrees, or more accurately, the one or two missing linkages to connect up people already there, as many of David's "cousins" married my "cousins",  in Caithness, Australia, and New Zealand.