An acute fault is "Himalayan front fault" cut the alluvium in foothill region, this fault is a series of en-echelon faults which are parallel to the strike of the hills between the Punjab and Assam. Northward, this sequence is terminated by MBT, which is a set of north dipping faults and forms the boundary between Southern Himalayas and Lesser Himalayas. The Sivalik Hills and sub‐Himalayan region is home to the Soanian archaeological culture.
An acute fault is called "Himalayan front fault" that cuts through alluvium in foothill regions. This fault consists of a series of en-echelon faults aligned parallel to the hills between Punjab and Assam. Moving northward, this sequence ends with MBT, which comprises north-dipping faults forming the boundary between Southern Himalayas and Lesser Himalayas. The Sivalik Hills and sub-Himalayan region are home to the Soanian archaeological culture.