Clay figures of the Mother Goddess as the symbol of fertility have been found- these were worshipped by the people. A seated figure of a male god carved on a small stone seal was also found. The seal immediately brings to our mind the traditional image of Pasupati Mahadeva. In addition to this we come across numerous symbols of the phallus and female sex organs made of stone which may have been objects of worship. Certain trees seem to have been treated as sacred such as papal. They also held the bull sacred. Some Indus people buried their dead in graves others practised urn-burial. They believed that there was life after death because the graves often contained household pottery, ornaments and mirrors which might have belonged to the dead persons and which it was thought he or she might need after death. Around 1750 BC Mohenjodaro and Harappa declined but the Harappan culture in the other cities faded out more gradually. Various causes have been suggested for this. Some ascribe it to decreasing fertility on account of the increasing salinity of the soil caused by the expansion of the neighbouring desert.
Others attribute it to some kind of depression in the land which caused floods. Others point out that the Harappan culture was destroyed by the Aryans but there is hardly any evidence of a mass scale confrontation between the two.