Abstract
The Kathmandu basin, Central Nepal Himalaya, is the best target for clarifying the variability of the Indian monsoon climate and its linkage to the uplifting of the Himalayan-Tibetan orogen. Our group has started an academic drilling project "Paleo-kathmandu Lake (PKL) project" which is for the first time continuous drill cores of the Kathmandu basin-fill sediments obtained for the propose of an academic research. We report the variations of paleoclimate and paleoenvironment of the Kathmandu basin reconstructed by clay mineral study of the sediments.