1808.] Geological features of Bhootan Dooara. 117 



probable; and in nearly every case where gravel deposits are seen 

 some side ravine below, having its sources high up, can be pointed 

 out, whose glacier has formed a temporary stoppage to the main river 

 into which it ran : and such effects are still in progress in the 

 highest ranges of the mighty Himalayas. When glaciers extended 

 clown to 5,000 feet, what must have been the appearance of the upper 

 Shayok, Indus and Chang Chungmo, where 12 to 13,000 is the 

 lowest level of the country ; contemplation of such a scene in the 

 mind's eye renders the formation of lakes and the accumulations 

 of detrital matter a natural sequence very easy to imagine. Further, 

 when such powerful forces of ice and water were in action, their 

 results would have extended far down the main drainage lines, and 

 arc to be sought for at the debouchements of such rivers as the 

 Indus, the Sutlej, Ganges, &c.j and I believe that the more recent 

 accumulations of immense boulder beds composed of rocks from the 

 inner ranges, such as may be seen in the Noon Nuddee, Deyrah 

 Dhoon, and other places along the base of the Himalayas, may owe 

 their existence to a glacial period in those mountains. 



Mies on Geological features of the country near foot of hills in the 

 Western Bhootan Dooars.-By Captain II. H. Godwin- Austen, 

 F. B. G, S., Topographical Survey. 



[Reccivod, 26th March, 1867.] 



In the report ' On the coal of Assam, with Geological notes on the 

 adjoining districts to the south,' &c. by H.B. Medlicott, Esq., Deputy 

 Superintendent of the Geological Survey, published in the Memoirs of 

 that Survey,* allusion has been made to certain geological features 

 of the hills bounding the Western Bhootan Dooars.f 



A few more explanatory notes on the formations to be seen there 

 may prove of interest in connection with the above paper, and lead 

 others who may have the opportunity to observe them more closely. 

 The base of the Himalayas is there so densely wooded that much 



Mem. Geol. Survey of India, Vol. IV. p. 387. See pages 392 and 435, 436. 

 T See the map of " Bhootan and country adjacent" on the scale of 4 miles 

 to the inch for all places mentionod in this paper. 



17 



