Yes, of course there is; I'd even checked out Barbara WILSON, daughter of Thomas in order to find the
year (1787). And had found that, unfortunately, it's one of those online females-only IGI batches.
That upper case 'T' in the WILSON line is, to my eyes, nothing like the first letter of the word
after Smith in the NICHOLSON line.
The more I look at it, the more convinced I am that it is Roucan - but of course I could be wrong.
Maggie, there's a Will for a John NICHOLSON in Roucan, Dumfries Commissary Court, 1815 - might be
worth checking out? (On SP it's listed as Roncan and as Dumfries Sheriff Court).
JAP