Mitsuo Yoshida
Department of Geology and Mineralogy, Hokkaido University
Sapporo 060, Japan (Present Address: Department of Geology, Trichandra Campus, Tribhuvan University, Kathmandu, Nepal)
Yaeko Igarashi
Department of Geology and Mineralogy, Hokkaido University, Sapporo 060, Japan
Fluvial and lacustrine sediments distributed in the Kathmandu Valley are divided into eight stratigraphic units in ascending order. The Lukundol Formation, Pyanggaon Terrace Deposit, Chapagaon Terrace Deposit, Boregaon Terrace Deposit, Gokarna Formation, Thimi Formation, Patan Formation and Lower Terrace Deposit. The age of theLukundol Formation may be Pliocene to Early Pleistocene; on the other hands, the Gokarna, Thimi and Patan Formations correspond to the Last Glacial Epoch, based on the data from radiometric dating, paleomagnetic measurement and pollen analysis. The southern area of the Kathmandu valley adjoining the Mahabharat Mountains has probably been upheaved in Early to Middle Pleistocene after the deposition of the Lukundol Formation.
