The cairn appeared to be associated with an adjacent circular enclosure. The thought occured perhaps similar to the arrangement upon Allt-llwyd at SH6145807631? Perhaps.
Grassy cairn below and to the approx south-west of much more upstanding cairns gracing Allt-Lwyd, outlier of Idris’s domain. The monument is passed by visitors approaching the hill from the terminus of the minor road at Cae’r Mynach.
Unfortunately Coflein currently has no detail aside from assigning a Bronze Age ancestry.