Like Bruce said in his observation, " It's hard to tell whether the slabs are breaking on top of the pre-existing faceted layer (with surface hoar mixed in) or on the low density snow just on top of the faceted layer." The crown line was already beginning to fill back in when I got there. Looked to be a decent avalanche because there was snow piled four to six feet up on the up-hill side of the trees where the avalanche traveled.

I hope I got the location right. I do not travel the PC ridge much...