Whilst it appeared on the second edition of the Ordnance Survey 6-inch map, no physical trace of this ancient monument remains today. The stone's disappearance represents one of countless prehistoric markers that have been lost to time, agricultural development, or perhaps deliberate removal over the centuries.

The site was documented as part of the comprehensive Archaeological Survey of County Donegal, compiled in 1983 by Brian Lacey and his team of researchers. This ambitious project catalogued field antiquities spanning from the Mesolithic Period through to the 17th century, creating an invaluable record of monuments that might otherwise be forgotten. Standing stones like the one at Tullydonnell Lower typically date from the Bronze Age, roughly 2500 to 500 BCE, and were erected for purposes that remain largely enigmatic; theories range from territorial markers and astronomical alignments to commemorative monuments for important individuals or events.

The loss of this particular stone highlights the fragile nature of Ireland's archaeological heritage. Across County Donegal and indeed throughout Ireland, numerous prehistoric monuments have disappeared from the landscape, surviving only in historical maps and survey records. These documentary traces serve as ghostly reminders of a once richly marked ritual landscape, where standing stones dotted the countryside like ancient sentinels, their meanings and purposes now as absent as the stones themselves.