Barton crack

L of the bolted arete, climbs the crack/slab to an old pin, then direct up. Alternatively step L after the 1st pin to a slab and thin crack and passing another pin. 

1st route on the sunny south facing side of the thunderbird. ( situated on your L at the start of at all the good quality red rock that eventually forms an almost enclosed amphitheater, with the waterfall at the back of it.   It is directly opposite the short path up to the windy gully routes)

trad