“Cerrig Saethau (Arrow Stones) near Llanfairfechan” by W. Bezant Lowe in Proceedings of the Llandudno and District Field Club Vol. VII 1912-13 pp. 61-65 gives the following description:
“The stone measures roughly 4 feet by 5 feet, but it is broken into two pieces. The surface is flat, and the stone is rounded at the edges. The grooves, which vary from 3 inches to 10 inches in length, correspond with the size of an arrow head, the width varying from 3/16 inch to 1/4 inch, and the depth being 3/8 inch. The markings occur in groups.”
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