94 NOETLING: PETROLEUM IN BURMA. 



clay (c) is aDsent, the first and second sand thus forming a continuous 

 series. Nowhere within the Kodoung area, except well No. 21, is oil 

 found in this sand ; it is usually dry, but sometimes yields a good 

 deal of water. 



It is possible that on the eastern side of Kodoung this bed is 

 represented, as for instance in No. 3, by a series of thin alternating 

 beds of clay and sandstone which are usually termed shales. 



(<?) Below this bed follows a remarkable stratum of darkish blue 

 very tenacious clay, apparently without the slightest admixture of 

 sand. This bed is a very constant one and has been found in all the 

 wells where it caps the petroliferous sands. In thickness it varies 

 very much and it is quite certain that in some instances like Nos. 11, 

 6o, etc., it forms together with [a) and (b) clay, to the entire exclu- 

 sion of the 1st and 2nd sand, an argillaceous layer of consider- 

 able thickness. 



(/) The third oil-sand has been found in all wells, but to judge 

 from the boring registers it must vary a good deal in thickness. It 

 contains petroleum in a considerable quantity in all wells except Nos. 

 64 and 68 at Kodoung and Nos. I, V and VII. It is remarkable 

 that in some instances the upper part of the third sand contained 

 water which was followed by oil, for instance well No. 61 ; in others, 

 like No. 36, the petroliferous layer was of small thickness, and was 

 followed by a thick water bearing layer. 



Wells No. A and No. 6 have such a remarkable boring record, 

 that, provided they are correct, we are bound to suppose that by the 

 intercalation of an argillaceous layer (e') the part (/') containing a 

 considerable quantity of petroleum, has been separated from the 3rd 

 oil sand. It is only in the above two instances that this feature has 

 been noticed, and as these two wells belong to the earlier wells, when 

 no special care was taken with regard to the boring register, it 

 is quite possible that some error has crept in, in fact it is almost 

 certain that the boring register of well No. 6 must be incorrect, 

 because, as it stands, it hardly fits in with the adjoining wells. 

 ( Mo ) 



