xxxiv Report of the Miner alogical Survey [No. 126*. 



58. Those belonging to the tract to which the present description is 

 confined, are the Pinjore Doon or valley, the debouche of the Guggur ; 

 the Kyarda Doon, the debouche of the Jumna and Ganges ; and the Pat- 

 tee Doon, the debouche of the Ramgunga. They are all bounded, or 

 separated from the plains by a low chain of hills, which is also a line of 

 water-heads, and contains the sources of those streams which, engulph- 

 ed in the tract immediately at their feet, afterwards spring up in the 

 Teraee, occasioning the humidity of soil which is so characteristic of that 

 tract. 



59. The Dehra Doon, which is the principal of these vallies in extent, 

 and probably the only one demanding a detailed description, is from the 

 Jumna to the Ganges about forty-five miles in length. Its breadth is 

 variable, being in some places scarcely ten, in others fifteen miles. 28 

 The surface is undulated, and has, in particular directions, a strong decli- 

 vity. 29 Many banks or steps occur, varying in height from one to 

 thirty feet. These generally follow the course of the streams, one 

 on each side ; appearing to have the same relation to them which the 

 Kadur, or marshy lands of the plains, have to the rivers there. Their 

 distance, or the breadth of the channel they mark, is very considerable 

 even in the case of the smallest stream, and they exhibit the same 

 variations in arrangement which the river banks in the plains do. 30 

 There is little question but that they have once been the beds of 

 running water, however incapable the present streams may appear 

 of filling them even in their highest floods. 



60. The drainage of this valley is effected entirely by the two rivers, 

 Asun and Sooswa, which rising within a few hundred yards of each other 

 near the middle of the valley, run in opposite directions, the former to meet 

 the Jumna, the latter to the Ganges. The fall of these rivers is consider- 

 able ; the elevation of the source of the Asun being 2,148 feet above the 

 sea, and its confluence with the Jumna 1,469 feet, being a fall of 652 

 feet in little more than twenty miles. The fall of the Sooswa in a course 



28 The admirable new road made by the Honorable Mr. Shore, leading from the 

 Keeree Pass through Dehia to Raj poor, at the immediate foot of the northern hills, 

 measures, 1 think, fifteen miles. 



29 The base which I measured in the Doon in 18J9, had a difference of level of 300 

 feet between its two extremities. Its length was about four miles. 



30 That is to say, a steep bank is always opposed to a low shelving one. When both 

 are alike, neither are observed to be remarkably steep or shelving. 



