82 N0ETL1NG : PETROLEUM IN BURMA, 



the following diagram. We see here a series of perpendicular or 



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 IMP 



lw 



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S" •illil'l, 1 ," 



/.a 



Fig. 5. Diagrammatic section showing the intersection of perpendicular, horizontal 

 and diagonal veins of eruptive mud in miocene sandstone, Taungle-yo, east Of 

 Berne village. 



highly inclined veins which intersect a fine soft sandstone, filled with 

 clay, or rather fine mud. The structure of the material proves clearly 

 that it must have been forced up into the fissures, completely filling 

 them. The mud consists of a mass of fragments of sometimes well 

 stratified clay, which are arranged in lines roughly parallel to the 

 walls of the vein. It is quite evident that the surface of these clay 

 fragments must have been moist and in a more or less soft state, 

 thus allowing them to be compressed into a homogeneous mass, 

 while still preserving their individuality in the core. If the expres- 

 sion may be allowed, these mud veins exhibit a porphyritic structure. 

 Frequently hard concretions are imbedded, like (a) in figure 5. For 

 a certain distance from either side of the walls the mud is usually 

 more or less impregnated with a whitish alkaline substance. 



In the above section the perpendicular veins intersect horizontal 

 ones of the same structure, and in one instance at least it is quite 

 clear that they must have passed through the horizontal beds 

 producing sometimes a small dislocation. In the majority of the 

 cases the substance of the horizontal and vertical veins has been so 

 intimately anchylosed that it appears as if the horizontal beds were 

 ( 128 ) 



