ANTICLINAL FOLDS. 5 1 



It has been shewn before 1 from the cases of Yenangyaung, 

 Yenangyat, etc., that in Burma, as in other countries, the workable 

 deposits of oil are only found in those parts of the oil-bearing beds, 

 which occupy the highest and most elevated points of the anticlinal 

 folds. In Burma the oil is obtained from lower miocene (Prome) beds, 

 and so the only places where we can look for it with any chances of 

 finding it in workable quantities, are where the miocene beds are 

 exposed near the crests of anticlines, and then the higher the lower 

 miocene beds are elevated, and the nearer they are brought to the 

 surface, the greater the probability of finding petroleum. In other 

 places, where the miocene beds are overlaid by pliocene sandstones, 

 there is no hope of there being an exploitable area, as even if oil were 

 present in the sands below, it would be at too great a depth from the 

 surface, and besides it is very improbable that there is workable oil in 

 the lower lying part of the sandstone. 



Applying these conditions to the Singu- Yenangyat anticline we 

 find that there are three known separate places along it, where the 

 crest of the arch rises to a maximum, and where the resulting dome- 

 like elevations of the Prome beds are at, or close to, the surface of 

 the ground, and these three places are Moksoma-kon near Singu, 

 Yenangyat, and in the hills near Sabe. 



First, I will take the case of Yenangyat as it was known pre- 

 viously. At Yenangyat the first oil sand of the lower miocene is 

 close to the surface in the beds of the Yenan-C-Chaung, the Ok 

 Chaung and the Ywaya Chaung, in places which are not much 

 elevated above the level of the Irrawaddi river. By mapping one of 

 the sandstone beds (the Signal hill sandstone) of the upper 

 miocene, which is about 350 feet above the first oil sand, I have been 

 able to trace the up and down movement of this oil-bearing bed as 

 one goes f o the north and south. This Signal hill sandstone be- 

 comes entirely covered up by newer beds in block 15, to the south of 

 Yenangyat, and in block B to the north, and so for a distance of at 

 Memoir^ G. S., U, Vol. XXVII, Pt. 2, p.i 59 ct seg. 

 Ef ( 5* > 



