I wonder is that the remains of the hill fort below your location and visible on google maps in this link ?
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=52%C2%B0+34%27+49.86%22+N+++%098%C2%B0+30%27+16.48%22+W&sll=51.811452,-8.539288&sspn=0.059645,0.207539&ie=UTF8&ll=52.579564,-8.503987&spn=0.003664,0.012971&t=h&z=17
The hill fort is where the cliff edge is. There are at least two barrows down lower. I take it your the guy from boards.ie with the motor-bike?