58 GRIMES : MYINGYAN, MAGWE AND PAKOKKU DISTRICTS. 



of the Yenangyaung hills and the plain extending southwards and 

 eastwards from Pagan. 



The hills which are formed of beds bent in anticlinal arches are 



Pliocene ami miocene composed of pliocene beds with, as a rule, 



beds compose the hills. miocene beds exposed by denudation in the 



centre of the anticline, the pliocene beds consisting of soft yellowish 



sandstones mostly coarse and containing hard concretions and 



layers of red ferruginous gravel and the miocene beds being inter- 



The Principal hill stratified layers of shale and sandstone. The 



ranges examined: chief of these ranges f hil ] s which { examined 



are those formed by the Yenangyaung anticline, the Singu anticline, 



the Pagan anticline and the Gwegyo anticline. Besides these there are 



other ranges of less importance composed entirely of pliocene beds. 



The Singu hills I have described in another paper, and it will 



Area under examina- perhaps be convenient if I divide the rest of 



tion exclusive of the V • , . . 



Singu hills, divided, for the area into several portions and describe 

 fntoTplrts? description * each in turn in the following order ;- - 



(I) The Yenangyaung range of hills. 



(II) The Pagan 



(III) The Gwegyo 



(IV) The intermediate country. 



(/) The Yenangyaung anticline and range of hills. — The 



The Yenangyaung ran S e of hIlls which runs close to Yenangyaung 

 range of hills, extends northwards into Myingyan district for 



their extent, about fifteen miles, and southwards I have 



traced them for ten miles, but had not reached the end of the hills. 

 These hills are formed of beds bent into an anticlinal arch the axis 

 of which north of Yenangyaung has a direction 20 W of N, E of S, 



but at the Yenangyaung oil-field the direction 

 and d ir ect 10 n. ^^ ^ ^ Q W of N> S of E and to fche SQuth ifc 



continues in this direction as far as the limits of my survey. 



The anticlinal arch rises to its greatest height at Khodaung 



between two and three miles east of Yenan- 



anUcUne." ° f SUmmit ° f gyaung and towards the north and south it 



gradually sinks down so that at Lebingon and 



58 ) 



