ネパール中央西部,ティナウ川-ビナイ川地域のチュリア(シワリク)層群

The Churia (Siwalik) Group of West Central Nepal, reported in previous papers (Tokuoka et al. , 1986, 1988)is traceable stratigraphically and structurally to the present study area. The group is divided into the Arung Khola, Binai Khola, Chitwan and Deorali Formations in ascending order, has a total thickness of 4,000 to 6,000 m and ranges in age from about 15 Ma to the Pleistocene . The group as a whole , is comprised of a coarsening-upward sequence , reflecting the rise of the Himalayas. The Churia group is separated from the Midland Group by the Main Boundary Thrust in the north and from the Alluvial deposits in the Gangetic Plain by the Frontal Churia Thrust in the south. The Central Churia Thrust divides the Siwalik (Churia) Hills into North and South Belts. A geologic map, columnar sections and route-maps are shown in detail in 10 appendix-figures. The results of paleocurrent analysis and sandstone petrography are also discussed in the present paper.