A couple of Salt Lake skiers triggered this while skinning up Lineer Ridge (you can see their skin track immediately above the right flank of the slide in the photo). I skied up from the opposite side of the ridge and met them on top. They said it broke down three or more feet at the crown. Although I haven't been up on the slide to inspect it, it looks like it may be a prime example of the persistent slab we've been hearing so much about.