This tall, narrow monument rises 1.74 metres from the ground, its irregular shape tapering from a width of 64 centimetres at the base to just 20 centimetres at its weathered top. Despite its prominent position on the gently sloping pasture, this ancient marker has somehow escaped the attention of official surveys; it doesn’t appear on any edition of the Ordnance Survey maps, nor is it listed in the county’s Sites and Monuments Record or Archaeological Survey. According to the landowner, the stone has stood in this spot for at least three generations, a silent witness to the changing landscape around it.

The mystery of this standing stone deepened during archaeological monitoring work in 2001, when improvements to the R252 Ballybofey to Fintown road brought archaeologists to the area. The road scheme, which involved widening the carriageway from 4 to 5 metres along a 2.3 kilometre stretch, prompted a thorough survey of potential archaeological sites. Whilst the team was primarily concerned with locating the lost site of Templemonaghan, recorded as an abbey on older maps but with no visible remains, they documented several intriguing features. Among these was a curious grass-covered mound near Dooish School, initially thought to be of archaeological significance but later revealed to be a natural formation of stony gravels when stripped during construction.

The standing stone in Thomson’s Field, positioned about 100 metres north-west of this mound and close to the old Stranorlar-Glenties railway line, continues to intrigue those who encounter it. Local folklore connects it to another standing stone further up the Finn valley, suggesting it may have been part of a broader prehistoric landscape. Though foot-and-mouth restrictions prevented archaeologists from examining it closely during the 2001 survey, its enduring presence in local memory and its physical persistence through centuries of agricultural activity hint at its significance to past communities. Whether it served as a territorial marker, a ritual site, or held some other purpose remains unknown, making it one of those tantalising remnants of Ireland’s deep past that refuses to yield its secrets easily.