108 NOETLING; PETROLEUM IN BURMA. 



The line rises therefore from the poor well No. 66, towards the 

 indifferent well No. n, remains steady up to the similar well No. 18, 

 rises again to the rich well No. 22, falls quickly to the poor well 

 No. 12, rises from these steeply to the rich well No. 43 (13 of course 

 included) falls towards the indifferent well No. 58, here I may add 

 that if the direction from 58 to the rich well No. 25 which runs at 

 about a right angle to the direction of the main section is followed 

 up it will be seen that there is also a considerable rise -, 1 from 58 the 

 line rises again towards 27 and 26, beyond which this section can- 

 not be continued, neither No. 55 or 48 bringing in any new feature, 

 while No. 56 is most probably already on the eastern side of the 

 belt. If we consult the section we notice that, excepting slight 

 local differences in the thickness, the undulations of the 3rd oil-sand 

 are followed by clay (<?) but above the latter bed we notice some very 

 curious differences which will presently be discussed. 



These facts I believe prove sufficiently that the top of the 3rd 

 oil-sand describes a series of undulations along a line which is 

 almost parallel to the present strike of the strata. I will now 

 attempt to show the connection which may exist between this 

 undulating line representing a vertical, and the zig-zag lines probably 

 representing horizontal contour lines. The theory of the intersecting 

 folds as applied to the Yenangyoung oil field requires the presence 

 of a trough or basin on the western side of the tract between wells 

 Nos. 47 and 22. Unfortunately a connecting link is missing here, 

 that is to say, a well between Nos. 19 and 18, and it may be ques- 

 tioned whether it is admissible to place well No. 17 in this place. 

 However it is quite evident that a ridge does exist extending from 

 No. 47 in south-westerly direction, which is crossed by a line which 

 connects Nos. 66 and 19, indicated by a rise. The presence of the 

 sag or trough between 18 and 19 is not quite proved, but it seems to 

 be indicated by the rise from Nos. 19 and 18 towards No. 11 and 

 further on towards No. 47. 



1 For obvious reasons well No. 25 has not been included in the diagrammatic 

 section. 



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