The unexplained lozenge near Stonehenge

A lozenge of shallow hollows about 60 m across, centred near SU 12544 42780, about 660 m NNE of Stonehenge, inside a shallow dish about 140–150 m across. The north half is clearest; the south half is fainter. Interactive 3D model from Environment Agency lidar. Drag to orbit, right-drag/two fingers to pan, wheel/pinch to zoom.