THE PATLI DUN. 59 



layan zone. This cannot be considered to be beyond the scope of 

 this memoir ; for, as all knowledge is relative, we may not be said to 

 possess a thorough mental grasp of the Sub-Himalayan zone, unless 

 • we study it not only in its own relations but also in connection 

 with the older rocks in contact with it. 



This s6t is a little east of Jinti Rau trigonometrical station, and 



cuts across the Nahan zone north-east of the 

 Kilani sot. (30) ,. ,-_ 



rath dun. I here are no very good rock ex- 

 posures, but such as there are give a W.N.W. — E.S.E. strike — the 

 normal Himalayan strike. The dips are sometimes high and some- 

 times low, in a general N.N.E. direction. It is impossible to say 

 whether these represent a uniformly ascending series or not : most 

 probably not, however, and what we really have is a few closely 

 packed and probably inversed folds, something similar to those in 

 the Rdmganga above Garral. The south edge of the Nahan zone in 

 this locality coincides with the river bed, and also with the strike of 

 the rocks, that is to say, it lies W.N.W. and E.S.E., but when the 

 Delidunga and Gaujera Raus are reached there is a noticeable 

 change. 



This stream cuts across the greater part of the Nahan zone in a 

 Gaujera (Goajada) diagonal direction. In its lower part it is 

 Rau> to 1 ) named the Delidunga Rau on the maps of the 



Forest Survey. It rises in the higher ridge overlooking Jhirt, in the 

 Mandal valley. This ridge, in its main features, is a synclinal; but, 

 as the exposures on the north face are few and rare, it is possible 

 that there may be a N.N.E. inversion abutting against the main 

 boundary fault, as is the case lower down in the Manda*! near where 

 it joins the Ra*mganga, and as will be found in the Pelani R. Still, 

 generally, it is a steep synclinal with dips of 30 and 40 S.S.W. on 

 the north face, and with opposite dips on the south face. The latter 

 dips continue down from the ridge until the bed of the Gaujera stream 

 is reached, and increase in height up to 6o°, 70° and 8o°, verticality 

 being reached finally. About half a mile from the ridge a sharp 

 anticlinal fold comes in, and the dip turns over towards the S.S.W. 



( ii7 ) 



