In reply to Captain Solo:
> it's the line between sunlight and shadow in the centre/ upper half of the pic.
That's Archer Ridge. Quiver rib is the vague rib about two thirds of the way left of that, between it and the shadowy corner, trending up and right, then up and left higher up. Pretty much exactly halfway across the picture, from left to right.
> I'm struggling to see the figures mentioned though.
Catching the sunlight under the shadowy corner, at the left end of the grassy ledge where the sunlit ramp comes down.
Post edited at 09:33