This unusual row of stones is one of Oman’s more enigmatic archaeological finds: found in eastern Yemen & South West Oman, C.400 B.C.E – 300 C.E.
The stones are usually found in groups of 3 to 15 (although longer rows have been seen) about 2 or 3 foot high and standing on end, forming a tripod structure with sometimes a capstone. Placed along side & parallel with Wadis or tracks; mostly stood on bedrock.
They are not burial places because they seem to be always placed on a hard rocky surface and that is about all anyone can be certain of. The construction period has been reasonably well confirmed by Carbon-14 dating, from ash remains of wood fires that seem to have been used within the structures.
The fence has been placed for their protection; a lot of sites can get damaged through ignorance or just basic theft of the stone as building material.
P.S I can thank Freyja my daughter who noticed these while we were driving some way off on the main road.