The megalithic period in Karnataka is significant as it witnessed technological developments like the beginning of use of iron and fast wheel for the making of pottery as well as socio-economic and institutional developments such as the emergence of an agrarian base, demographic expansion, rudimentary craft specialisation, a developing exchange network and a degree of social differentiation. Many features typical of the megalithic phase continue into the early historic period. In fact, the megalithic and the early historical do not essentially represent two distinct chronological entities and are found overlapping at certain sites. So far, there is no literary evidence for the culture, and there is nothing to suggest that the society was literate—if graffiti on the megalithic pottery do not turn out to be symbols of writing