A bank and ditch, running c.254m E-W across a NE facing slope, with the ditch on the N of the bank.
Investigation has traced the dyke for a further c.70m westwards to Garth Ucha (SJ13002325), and c.90m N-eastwards to the foot of Allt Tair ffynnon mountain (at SJ13682347).
(source Os495card; SJ12SW4)
