More than 500 stone age implements have been recovered from Tiruchi, Pudukottai and Namakkal districts, pointing to human habitation during the Lower and Middle Palaeolithic periods. The finds, largely fashioned from quartz, include hand axes, cleavers, choppers, flakes and multi-directional discoidal cores. Sites yielding the tools include Kurumbappati, Kallikudi, Valkaradu, Veeramalai, Nadukattupatti, Mullipatti, Malampatti, Sarugumalai, Sitharmalai and Thalaimalai. Microlithic tools recovered at these locations also indicate that the sites were occupied during a later prehistoric phase, adding to the evidence of a long sequence of early human activity in central Tamil Nadu.