Contemporaneous with the decline of the Indus Civilization, the Pirak Culture with its characteristic geometric polychrome pottery arose on the Kachi plain where the site of Mehrgarh had also prospered. Here horses and camels were domesticated for the first time in South Asia, and the riding of horses is clearly attested. Another major transition occurred as summer crops, namely sorghum and rice, were added to the existing winter crop assemblage which was dominated by wheat. This saw-toothed stone sickle was probably used to harvest these cereals.