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.
The acute fault known as "Himalayan front fault" slices through alluvium in foothill areas. This fault comprises a series of en-echelon faults parallel to the hills between Punjab and Assam. Moving northward, this sequence is terminated by MBT, which includes north-dipping faults delineating the boundary between Southern Himalayas and Lesser Himalayas. The Sivalik Hills and sub-Himalayan region are home to the Soanian archaeological culture.