With one of the recent BigY sales at FamilyTreeDNA, the opportunity was taken to test four of the Lineage 1e FAIRBAIRNs, and analyse their results at yFull.com.
The latest version (5.04) of the yFull tree now shows that this has resulted in the creation of a new branch of the tree underneath I-Y7277 (which was estimated by yFull as having been formed 3400 ybp TMRCA 3100 ybp) which is where they are currently shown on FTDNA.
The new branch is I-Y32666, with an estimated formation date of 3100 ybp but a TMRCA (time to most recent common ancestor) of 225 ybp, ie 1725.
The DNASurnames Haplogroup tree which shows yDNA tree branches, along with line patriarchs and tested participants (if approved to do so, has been updated (http://dnasurnames.info/dchaplogroupi.htm#a20)
We believe, from papertrails, ySTR testing and a bit of "a miracle happens here" for one or two of the links, that all four tested descend from John FAIRBAIRN and Bessie FLINT whose children were baptized at Melrose, Roxburghshire from 1729 to 1740, and one at Smailholm in 1741.
So how much earlier were all the branches for the matching I1 Fairbairns formed?
That will take an interested party, or two, from any of other groups at
to also test BigY and analyse the results at yFull.