The Moss Farm site (sometimes known as Machrie Moor 10) is the first prehistoric site you come to on the path to the more famous standing stones further east. It is probably not directly associated with the Machrie Moor stones but is a totally separate monument, erected at a different time.
The information plaque erected by Historic Scotland puts into words my own question about the site, 'Is it a stone circle with a later burial cairn built inside it or is it simply a cairn with a permanent stone kerb?'. The stones are rather short and stubby, not the tall, striking stones you will find in Machrie Moor grouping itself.
The ring cairn has been badly disturbed by stone robbing and the road that cuts across part of the site.
The site was originally a burial cairn of small stones surrounded by a 22m (72 feet) diameter kerb of standing stones and supported by an outer bank of stones. Only 7 upright stones remain, all roughly 1.3m (4.3 feet) tall. Another five stones have fallen on their sides.
These roughly-shaped stones are strikingly different to the tall, slender stones of Machrie Moor, visible just a short distance away on the other side of the farm track.
Getting There
Park at the signposted parking area on the coastal road 3 miles north of Blackwaterfoot. From the parking area, walk east along the farm track, signposted to the Machrie Moor stones, and you will see the Moss Farm Road site to your right after roughly 1km (0.6 miles).