"Their GD comparisons came out as follows (numbers across top in same order as descending): 117643 Donegal 0 7 10 10 14 13 36715 Sligo 7 0 12 13 17 19 149181 Roscommon 10 12 0 12 13 17 92019 Monaghan 10 13 9 0 13 14 145320 Kildare 14 17 11 14 0 20 20413 Scotland? 13 19 17 14 20 0 All I can see in this is that the Scotland entry shows the greatest variance, and therefore may be the oldest." The above chart was a comparison of GD distances between certain members of the Byrne project, selected to represent our various NWI subclusters. Perhaps a comparison of GDs against the L21 and M222 modals (K9VGV and M5UKQ) would be of more value. They come out as follows: M222 L21 Monaghan 5 15 Roscommon 6 22 Donegal 7 21 Sligo 8 24 Scotland 11 27 Kildare 12 33 The L21 figures are slightly skewered because in several cases Ysearch was comparing 74 markers rather than the usual 67, but the order seems to be as listed. I assume this indicates that Kildare and Scotland are the oldest, while Monaghan is the youngest. Paul