46 MIDDLEMISS: PHYSICAL GEOLOGY OF SUB-HIMALAYA. 



The boundary runs some way to the south of the sot itself, as the 

 Dhansari (Thunghul- ma P shows 5 but a complete separation of the 

 Iy)s6t(i9) Nahan rocks from the conglomerate has not, by 



its means, been effected. Uplifted portions of the conglomerate to 

 the north of the main mass are left running out along the hill-spurs, 

 whilst the Nahans occupy the intervening stream-beds. There are 

 thus numerous examples of the conglomerate lying unconformably 

 upon the Nahans. The main mass of the conglomerate composing 

 the western continuation of the Karaungia (Chinal) ridge approaches 

 the faulted boundary with a dip of 15 , or 20 N. by E. except near the 

 Kosi, where the dip is more N.E. The conglomerate on the uplift 

 side has a lower dip in the same direction, scarcely ever exceeding 

 io°, which is also its average dip. The spurs which form the uplift 

 expand out northwards, as they gently descend into the Dhangari and 

 Sanguri (Shanguni) (20) sots ; and give rise to a number of sloping 

 chaors, of triangular form, and of the annexed shape : — 



This is a very common form of hill-slope in this country, both among 

 the Siwalik conglomerate and the sand-rock stages, and occasionally 

 in the Nahans, wherever the dip is down hill at moderately low 

 angles. The larger four-inch maps show the structure perfectly, but 

 the same cannot be said of the smaller scale map accompanying 

 this memoir. This hill-structure is especially favourable to the 

 growth of the sa*l tree. In the stream-beds between the chaors, and 

 ( 104 ) 



