This rock is down near the valley floor of Osmonds Gill. The best way to approach it is to carefully scamble down the Gill from the south, you'll see it amongst a bunch of boulders to your left.
This rock is No.68 in Beckensall & Lauries "Prehistoric Rock Art of County Durham, Swaledale & Wensleydale".
"68 is a slab near the vallay floor, and, rare for this area, has four concentric circles that cut across the 'grain' of the rock, and this adds to the valley's 'special' position in the landscape. From here rises one of the main streams that drain north, and the land opens out dramatically across the whole moor."
Prehistoric Rock Art of County Durham, Swaledale & Wensleydale.
S. Beckensall & T. Laurie
County Durham Books 1998