A small field system, part of the former farmstead at Blaen y Cwm, NPRN 242001. On the Merthyr Cynog parish tithe map of 1840, the field system is shown as consisting of three fields. The fields were still visible when visited in April 2008. Some of the banks had been overlain by 1970s military hedges. J.J. Hall, Trysor, 2 February 2008