North end of Harappa Mound AB, looking down on the Kot Diji phase levels from the heights above the Harappa phase baked brick wall (on the right) that has been covered with protective plaster for conservation.
Ancient Indus walls.
Clearing the ancient Harappan debris from the eroded surface outside of the mud brick city wall at the eastern edge of Mound E. In 1997 this area of Trench 11 was cleared to define the stratigraphic sequence between Period 3B and 3C.
The curving line of the mud brick city wall at the eastern edge of Mound E rose high above the level of an ancient street that followed the exterior of the wall.
As houses were built on top of earlier structures, the windows and doorways were blocked up. Notice the changing alignments as the walls were remodeled.
The brick wall may have been the foundation for a wooden superstructure and the white tags show where wooden posts were fixed. The doorway and threshold are located on the right side of the photograph above the scale.
The reconstructed brick wall is covered each year with a protective coating of clay and straw plaster. The original structure and unexcavated levels remain safely buried beneath a layer of bricks and back dirt.
Workmen are cleaning the Trench 11 area in preparation for photography during the 1997 excavation season. Perimeter wall  is on the left.
The Trench 11 area showing the perimeter wall (on the left), the curtain wall, and the Period 3C drain that cut deeply into the Period 3B deposits (see the labeled plan in 72). The sediments outside of the perimeter wall are hard packed ashy debris
Deposits of building debris and household rubbish were discarded over the perimeter wall into the open area below and were retained by the curtain wall.