Right Unknown

Alas, you probably won't find this problem in the same conditions that I did. Even as I climbed, it was still shedding rotten rock between the starting hold and the solid rock at head-height.

Starting on excellent underclings find something solid and make your way right to a large sloping sidepull (lots of good toe-hooks to help). A tough move gets you into solid holds and huecos above. I didn't top it out, but that's just me....