JOURNAL OF NEPAL GEOLOGICAL SOCIETY Registration No. 1/042/043 US Library of Congress Catalogue Card No.: N-E-81-91064 ISSN 0259-1316 Volume 33 June 2006 Published by: Nepal Geological Society, PO Box 231, Kathmandu, Nepal Email: publication@ngs.org.np Website: http://www.ngs.org.np Contents Geology and structure of Raniban–Champadevi area, Kathmandu valley, central Nepal K. K. Acharya and M. R. Dhital...................................................................................................................................................... 1 Mineral chemistry of augen gneisses from Tamakoshi–Likhu Khola area in east Nepal Kamal Raj Regmi............................................................................................................................................................................. 11 Microfacies analysis and diagenesis of the Lower Eocene Sakesar Limestone, Nilawahan Gorge, central Salt Range, Pakistan S. Ghazi, A. A. Butt, and M. Ashraf ...............................................................................................................................................23 Late Pleistocene pollen assemblages from Gokarna Formation (Dhapasi section) in Kathmandu valley, Nepal Khum N. Paudayal...........................................................................................................................................................................33 Delineation of basement structure from gravity data: example from Nara basin, Japan Dinesh Pathak..................................................................................................................................................................................39 Freezing–thawing effect and slake durability of some rocks from cold regions of Nepal and Japan Ganesh P. Dhakal, Junichi Kodama, and Tatsuhiko Goto.....................................................................................................45 Comparison of arsenic and nitrate contaminations in shallow and deep aquifers of Kathmandu valley, Nepal Jaya Kumar Gurung, Hiroaki Ishiga, Mohan Singh Khadka, and Nav Raj Shrestha.......................................................55