What is the primary geomorphic origin of the loessic and silty deposits found in certain elevated structural terraces within the sub-montane tract of Punjab near the Shivalik foothills?

💡 Solution & Explanation

The silty deposits along the sub-montane tracts of Punjab are largely attributed to wind-blown dust accumulation during drier phases of the Quaternary period, forming fine-grained loess-like deposits. Marine transgressions did not reach this far north during the Tertiary era after the final uplift of the Himalayas. There is no geological evidence of major explosive volcanic ash layers forming these specific terrace deposits in the Punjab plains. Pleistocene glaciers remained confined to high-altitude Himalayan ranges and did not extend down to deposit outwash directly in the Punjab sub-montane plains. Detailed stratigraphic analysis of these terraces helps reconstruct paleoclimatic shifts in northwestern India.