Three new photos from Bob Miner reveal a little bit more of the area surrounding the impressive platform cairn. If these areas look free from undergrowth there's a very good reason -- Bob's livestock has regularly grazed here. Above shows a few small piles built on boulders. A section of stone wall is visible in the back left.
Above is a view of the platform cairn across a stone wall and through the trees.
The above is the platform cairn itself. A probable niche built into the structure is visible at the base on the left -- one of several possible niches in the structure.