Excavations for the NRA for the N4 Sligo Inner Relief Road in 2002 revealed an early Neolithic causewayed enclosure (c. 4000 B.C.) at Maugheraboy on high ground overlooking the town from the south. This is the oldest causewayed enclosure so far discovered in Britain or Ireland. It consists of a large area enclosed by a segmented ditch and palisade, and was perhaps an area of commerce and ritual. These monuments are associated with the coming of agriculture and hence the first farmers in Ireland. According to archaeologist Edward Danagher, who excavated the site, "Magheraboy indicates a stable and successful population during the final centuries of the fifth millennium and the first centuries of the fourth millennium BC".