Nice shots and a good report. Its a fantastic spot. The abseil point takes folk down into the incised canyon section. They follow the creek down till it rejoins the upper track down near the track up to Evans Lookout. The upper track runs along the top of this crevice and at times you can see all the way to the floor well below. See also http://bushwalk.com/forum/viewtopic.php?f=36&t=4396&p=61832&hilit=grand+canyon#p61998