The site has two parts with extensive Harappan occupations from Early through Mature period (ca 3500-2000 BC). The upper part is a forty-foot high tell; the lower is the settlement below. Artifacts recovered from the site include copper-bronze objects, bangles and arrowheads; etched carnelian and other beads; and numerous terracotta human, bull, and bird effigy figurines.
Extensive excavations were conducted at Kot Diji by F.A. Khan and G.S. Ghurye of the Pakistan Department of Archaeology in the 1950s.
Sources
There are some great photos of Kot Diji on Flickr, mostly of the 18th century fort, which is enormously photogenic.
Possehl, Gregory L. 2002. The Indus civilization: A contemporary perspective. Altamira Press, Walnut Creek, California.
This glossary entry is part of the Dictionary of Archaeology. Any mistakes are the responsibility of Kris Hirst.

