34 GRIMES : MYINGYAN, MAGWE AND PAKOKKU DISTRICTS. 



hills on their western side, roughly parallel to the Irrawaddi 

 for several miles, has a considerable stream of water flowing in it 

 all the year round, and this stream enters the Irrawaddi at the 

 southern end of the hills. Its source is in the hill country to the 

 west. 



The slopes of the Singu-Tangyi hills are usually very rough, and 

 the surface is mostly covered with pieces of the hard concretions 

 from both the miocene and pliocene beds. They are, as a rule, barren 

 and uncultivated, and but little grass grows on the ground. Practi- 

 cally the only vegetation on the hills formed of pliocene beds is 

 the low, almost shrub-like acacia {Acacia ferruginea), and on the 

 hills of miocene beds the great majority of trees are either this 

 same thorny acacia or a thick-leaved euphorbia. This range is in 

 the dry zone of upper Burma, and the smallness of the rainfall and the 

 steepness of the hills probably largely account for this barrenness. 



The rocks which are exposed in the Singu-Tangyi hills are 

 miocene and pliocene beds, bent into an anti- 

 clinal fold, and recent deposits. The miocene 

 beds, which are exposed in the centre of the anticline, consist almost 

 entirely of upper miocene (Yenangyaung) beds, with interstratified 

 shales and sandstones, whilst of the lower miocene (Prome) beds 

 there are only a few small exposures. The pliocene beds, the expo- 

 sure of which surrounds that of the miocene beds, are soft coarse 

 sandstones with interstratified layers of red ferruginous conglomerate. 

 On the flat tops of some of the hills are patches of red ferruginous 

 gravel (plateau gravel), and in the lower ground there are deposits 

 representing an older alluvium and modern stream-sands. 



Along the Singu-Yenangyat anticline the lower miocene beds 

 Miocene beds. Prome (P™me stage) are only exposed in a few small 

 stage. patches. One is on the north side of Mokso- 



ma-kon, in block 58 N of the Yenangyaung oil-field, where the 

 anticlinal arch rises to a maximum, and here there is a small exposure 

 of lower miocene sandstone. Another exposure is in the bed of 

 (34 ) 



