*4 



N0ETL1NG: PETROLEUM IN BURMA. 



sending oft a short apophysis in the opposite direction ; it remains 

 quite conformable to the bedding of the sandstone for about 3 feet 

 then turns up again, passes into a higher level, where it again fol- 

 lows the direction of the bedding for some distance and then traverses 

 the sandstone to the surface. About 33 feet from the point where 

 (d) originally branched off from (a) both are joined by a vein of only 

 2 inches in diameter which shoots off at an almost right angle from [a) 

 and joins (d) about 8 feet above (0). It is not quite certain whether the 

 branch (b) is also a diagonal offshoot of (a), or whether it is an in- 

 dependent vein, merely traversing (a) ; its continuation towards a 

 lower level seems to indicate the former, but this may also be merely 

 an apophysis like (c) only somewhat stronger. However, whether 

 independent or not, this does not in any way affect the structural 

 importance of the veins here described. It may be remarked 

 that this section was exposed at one side of the deeply cut road 

 leading to well No. 510, whilst no signs of the veins were exhibited 

 on the opposite side of the road. 



The mud with which the veins are filled exhibits its usual lumpy 

 structure. It may be remarked that at one part of (d) it contains 

 so much of alkaline salt, that its appearance is very similar to 

 the gypsum veins. 



Fig, 7. Diagrammatic section showing unconformity and horizontal veins of 

 eruptive mud in upper miocene sandstone, near wells Nos. 530 and 541. 



Another very illustrative section, represented in figure 7, is seen 

 near wells No. 530 and 541 in the same part of the oil field. In a 

 ( 130 ) 



