Avalanche on East Shoulder of Job's Peak

Skied the Lightning Bolt/Exit Couloir off the East subsummit of Job's Peak today, and found evidence of a massive avalanche, that appears to have run naturally yesterday (1/19). The remnant of the crown was found at about 9000', on a NE aspect, and was eroded by the extreme NE winds of the past two days. No tracks were found entering the path, but  the winds may have erased them.We were unable to determine the height of the crown, but estimating in the 2 foot range. It spanned the full width of the upper couloir. Similarly, we could not determine the layer the avalanche ran on due to the extensive wind scouring post-avalanche, but we are guessing it ran on the interface of the new snow from the evening of 1/18-1/19 and the older snow beneath. Whether surface hoar or graupel was at that interface was impossible to tell. The slide ran full path, with debris deposition occurring between 6400-5800', so a vertical run of over 3000', and over a mile in linear distance. Debris piles were massive, with depths up to 4 meters or so. We would classify it as SS-N-R4-D3-U. We skied the line, which was still excellent, but was much more alpine in character, with a chalky, edgable, windbuffed bed surface being the dominant texture, until we reached the debris piles far below.