﻿614 



MR. L. V. DALTON OK THE 



[Nov. 1908, 



at first dip ver}^ gently away from the river at about 4°, then a 

 synclinal trough is crossed, with a correspondinjj,- gentle dip on the 

 west side, which continues until Xanzanma, on the Seikpyu-Sawmyo 

 road, is passed, when the dip increases to 11*^ ; and shortly after- 

 wards the Pliocene gives place to Miocene, though, as one ascends 

 into the hills, patches of Pliocene are continually met with, lying 

 across the upturned edges of the Miocene. The rocks of the latter 



Fie 



Sh etch- ma J) illustrating Expedition D. 



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Approximate Scale: 

 I inch=9 miles. 



consist chiefly of shales in the upper portion ; but subordinate sand- 

 stones occur, and, after the first 3000 feet or so, the sandstones and 

 shales alternate. At about the 25th mile from Sawmyo, the dips 

 increase from a comparatively low angle (10° to 25°) to 59°, 60°, 

 and even vertical, the whole series being very much disturbed and 

 crushed, so that it is not eas}^ to determine the thickness of beds 

 passed over. At the head of the Letpan choung, between the 23rd 



