TERTIARIES. 49 



Between the Chel and the Langti there are enormous recent boulder 



deposits,* which become finer to the south, and 

 Recent boulder deposits. _. .. . _. „ 



eventually graduate into the ordinary alluvium 



of the plains. They form cliffs of three and four hundred feet high 



about the debouchures of some of the rivers, like the Jaldoka. 



Remembering the difficulty frequently expressed by Mr. Medli- 



cott, of separating the true Sivalik strata of the north-western 



Himalayas from the recent deposits of the Duns, it struck me as 



possible that some of the deposits in question might represent the 



Sivalik group. I did not observe anything, however, tending to prove 



that such is the case, or leading me to make any separation in them. 



The deposits, which occur all along the base of the hills, may not in A 



reality perhaps be more largely developed here than elsewhere, but they 



are cut through much more deeply by the rivers ; and it is to be noted that 



this feature occurs in a portion of the strip where the Sub-Himalayan 



hills and rocks are absent. 



The latter reappear some miles east of the Tursa, and are thence found 



continuously as far east as the Sankos river, 

 Tertiaries near Baxa. . 



which was the furthest point I reached. At the 



debouchure of the Raimatang, there is at the base of the Tertiaries some 



two or three hundred feet of soft, dark-red, slightly micaceous, earthy 



sandstone and sandy clays mottled red and light greenish. Above them 



are soft massive sandstones of the ordinary type. The passage beds 



are exposed at the debouchure of the Jangti ; ascending the stream, we 



have, dipping at 70° to north — 



Soft white sandstone with black specks 



Sandy clay or clunch ; red, mottled with light green 



Grey clunch 



Light greenish clunch mottled with red 



Sandstone like the first-mentioned ... 



Ft. 

 40 

 30 



2 

 10 



5 



* Vide Major Godwin-Austen's paper, Journal, Asiatic Society, Bengal, Vol. XXVII, 

 pt, 2, p. 117. 



6 ( 49 ) 



