Cairn spill from the southern chamber area.
Obviously not an original feature, this area of spill is modern and poses a problem
for the interpretation of the western ( rear ) wall face.
As can be seen in the photo, the wall face north of the spill ( left ) is double
and east of the spill it is single, probably not the original
arrangement. Masters believed that the wall face to the north was originally
single, becoming double only in the region behind the northern chamber
and then switching back to single in the area now covered by the cairn spillage.
The rear of the cairn is not, of course, boomerang-shaped! The odd perspective
is a side-effect of the tilted fisheye lens used to get this
unusual view.