PETROLEUM. 49 



Moksomakon, a section shows miocene beds close to the centre of the 

 anticline with a dip of 57 east, which turns sharply to one of 6° 

 west, and then gradually increases to 20°, at the western miocene 

 boundary. From here towards the north the anticlinal arch 

 sinks and close to Singu we find that, on its eastern side, the 

 beds close to the centre have a smaller dip than in the last case. 

 On the other side of the Irrawaddi, near Lanywa, we find the miocene 

 beds on the east side with a dip of 48 , and on the western side with 

 dips varying from 13 to 20°, within the limits of my map. At 

 Yenangyat the crest of the anticline is close to the Irrawaddi, and 

 here we have very steep dips on the eastern side, and the bend at 

 the centre is very sharp; an examination, however, of sections 

 constructed from boring records shows that deeper down the bend 

 at the crest is not so sharp; on the western side the dip gradually 

 increases from 7 at the centre to 24 at the edge of my map, and 

 beyond this as far as the Yaw Chaung ; then it remains constant at 

 about the same angle in both miocene and pliocene beds. Both 

 north and south of Yenangyat we find the same structure, almost 

 the only variations being in the dips near the centre, and also, to 

 some extent, of the miocene beds on the eastern side of the anticline. 

 A few miles north of Yenangyat the dip of these beds increases until 

 they are vertical, and for a short distance they are bent over 

 so as to have a steep westerly dip. 



At Yenangyat the petroleum in the oil sands of the lower miocene 

 (Prome series) is worked both by drill and 

 wells. The dug wells, which are in the three 

 Ch.aungs, the Yenan-C-Chaung, the Ok Chaung and the Ywaya 

 Chaung, are worked by natives in the same manner as those at 

 Yenangyaung, described by Dr. Noetling ; l here they are generally 

 quite shallow and limited in number and are not producing a great 

 quantity of oil. Of the drilled wells of the Burma Oil Company 

 there were seventeen at the time of my visit. Regarding the 



1 Memoirs, G. S., I., Vol. XXVII, Pt. 2, p. 164 etseg. 

 E ( 49 ) 



