Explanation: Based on research, two independent cultural traditions of hand axe (Acheulian) and pebble-flake (Sohanian) industries were confirmed in India.

• Acheulian industry mainly had hand axes and cleavers. The Sohan industry is considered to have used only chopper and chopping tools.
• The Sohan industry gets its name from the Sohan river valley of Pakistan. These two cultural traditions are not considered distinct any longer.
• Recent studies argue that there was no independent Sohan tradition as Acheulian tools are found in the Sohan industry as well.

Source: Tamil Nadu NCERT