This appeared to be natural. Possibly from a cornice fall with warming. This area recieved the brunt of the North winds from earlier in the week forming yawning cornices and loading the thin snowpack below. The snowmobile party from Snake Creek did not mention it and I believe they were in this area earlier. ( I also think they would have reported it, No tracks anywhere near it from below) Slid on faceted snow above the early Oct-Nov crust.

Butch Adams inspecting the shear into the cornice face, and providing scale

All they said was "we didn't do it" Appeared very fresh at 1430hrs sun had not dampened the facets left on the bed surface