Sediment depth = depth from top of unit. Measurements for OSL were performed at the Wadia Institute (Dehradun, India). SAR protocol on 30 aliquots is used to estimate mean palaeodose (Murray and Wintle, 2000). All the aliquots showing recycle ratio within 10% are considered. Water content is assumed to be 10 ± 5% by weight for all samples. Least consists the least 20% (JK samples) and 30% (DAG samples) of the palaeodoses.