I was able to trigger this avalanche from the ridge by stomping on fresh drifts.  Continued snow transport from south winds and a large chunk of hangfire prevented me from examining the crown up close to confirm the weak layer.  With the amount of transport that was occurring, I figured it broke either at the new snow/old snow interface or within the new snow.  However, after examining a crown from a natural avalanche in the Dog Lake Chutes, I wouldn't doubt if this avalanche broke into last weeks low density layer.