Snow Nymph and I were at Trail Camp talking to a hiker who had recognized her, when we heard the rock slide. Sounded like nothing I'd ever heard out there before. Lasted quite awhile, maybe 30-45 seconds of continuous fall. When we hiked down from Trail Camp about 200 yards, I looked to my right, and saw the huge dust cloud. It appeared to be centered on the slope west of Consultation Lake and Arc Pass. Snowy got some pictures of the dust, but it was starting to get dark, but look for them in her Webshots album, coming soon.