http://ads.ahds.ac.uk/catalogue/search/fr.cfm?rcn=CPATSMR_100412 has Ffridd Can Awen cairn 3x0.2m at SH877536 and mentions a cairn 6 paces long by 0.6m(or different report of same), with many other stones being on the hillslope (the lot listed as field-system).