88 NOETLING : PETROLEUM IN BURMA. 



was it in the Berne or Kodoung oil -tract, owing to' the direction of 

 the ravines. 



More favourable was the direction of the Ayatpo-yo, at the 

 southern part of the Yenangyoung oil field and the adjoining slopes 

 of the Aungban-yo. The Ayatpo-yo cuts the petroliferous area 

 in an almost longitudinal direction, and it was therefore expected 

 that if any dip either in northern or southern direction did exist, it 

 would show here. 



The view plate VIII, will distinctly show that the bluish shales 

 exhibit a most marked inclination of about 7 to 8° towards north, an 

 observation which has also been confirmed at the southern part of 

 the Twingon oil field, where the same bed comes to the surface. 

 The same inclination is followed by the lower beds of the Yenang- 

 young stage, although much of it is counteracted higher up by the 

 irregularity of thickness of some of the beds. But on the whole a 

 most distinct northern inclination was noticeable. 



On the northern slope of the Aung-ban-yo it seemed as if there 

 was a slight southern inclination, although this could not be ascer- 

 tained owing to the beds not being well exposed. 



Towards the northern end of the Twingon tract a northern 

 dip was observed, but in this case it is not quite clear whether 

 this is not due to an altogether different structural feature presently 

 to be described. 



It is on the other hand quite certain that, further towards north 

 near the Pin-choung, the surface of the zone of Hippotherium anti- 

 lopinum exhibits the most distinct northern dip. 



Although very scanty, these few observations are sufficient to 

 support in a great measure the theoretically deduced view of the 

 existence of the longitudinal arch. In the southern part of the 

 field, where a southerly dip is required, we notice a southerly dip, 

 and in the northern part, where a northern dip is required, we notice 

 a most distinct northern inclination which could not entirely be 

 hidden by the irregularities of the sedimentation. 



We may therefore assume that it is unquestionably proved 

 ( J 34 ) 



