Wind-drifted hard slab that possibly ran into snow down near the ground as bushes were showing through on the bed surface. Very steep, rocky terrain in starting zone. The bed surface and debris had snow on top of it, so likely ran sometime during the day on Friday, February 5, or overnight on February 6. Did notice fresh ski tracks adjacent to the debris from a party that was likely skiing the apron, but the tracks and the slide seemed to occur at different times.