We've been thru this movie before, a couple of months ago.Sean O Se's version places the song in Castlecomer(Kilkenny), a coal mining (anthracite) town until the 1960s so maybe this explains the "marbe stones as black as ink". I suspect that the song is from Kilkenny, not Antrim, and that there is a Carrickfergus, or something very similar, in KIlkenny. When I get a chance I will try and check this out.