Composite of Barny's Wall. This is easily accessed from car park at South Head road end. Facing towards the sea, walk to your 10 o' clock. A nice lead is available up the left arete then traversing right to the end of the wall, this is Barny's traverse and is nominally graded as HS 4C

And of course, importantly you are climbing on the Middle Old Red Sandstone with the lower portion of the cliff reflecting deposition in an ephemeral lake and the upper portion indicative of lake shore processes.