Cropmarks of defended enclosure underlying Pen-Twyn house (NPRN 16040), Aberllynfi. The visible portion of the cropmarks are in the field immediately to the north west of the house, and measure approximately 70 metres south west to north east by 36 metres north to south. Photographed during the Royal Commission's programme of archaeological aerial reconnaissance by Toby Driver on 1st August 2013.
RCAHMW, 29th April 2019.