MIOCENE BEDS. 59 



Nyamigs about fifteen miles to the north it has disappeared and 

 become covered up by recent deposits. 



In the centre of the anticline near Khodaung, Iwingon and 



Minlindaung, miocene beds are exposed in an 



Miocene beds exposed area 5£ miles long by 1 mile broad in the 



in the centre of the •* ° J 



anticline : centre. With the exception of a small part of 



their extent. r 



the area in blocks 3 S and 4 S of the Yenangy- 



aung oil-field this exposure of miocene beds has been mapped and 



described by Dr. Fritz Noetling, and so I will 



Most of the miocene , . t t . . , 



exposure described by only give a few notes on the southern part of 



Or. Noetling. ... , ■ 



this area which was not mapped by him. 

 At Minlindaung at the south of blocks iS and 2S of the Yenan- 



gyaung oil-field, where Dr. Noetling's survey 

 the°miocene a P rea!° n ° ends, the exposure of miocene beds is about 



i mile wide, but in the next block to the south 

 it widens out to } mile wide. In the northern part of blocks 5S and 

 6S, however, a little over a mile south of Minlindaung the miocene 

 beds become covered up by Irrawaddi sandstones, and as the axis 

 of the anticline is sinking towards the south I did not find any 

 more exposures in that direction within the limits of my Survey 

 (Memoirs, G. S. L, Vol XXVII, Pt. 2, p. .) 



Of the miocene strata only the upper beds of the upper miocene 



are exposed and like those described by Dr. 



The miocene beds : only 



the top beds of the upper Noetling they are olive-coloured shales and 



miocene exposed. 



sandstones with very numerous pieces of 



gypsum scattered through them. The uppermost bed is a sandstone 



^, of a brilliant white colour ; in places this is 



The uppermost bed, a r 



remarkable white sand- stained red, etc., but its colour is always brilliant 



stone. t J 



and in striking contrast with the dull colour of 

 the Irrawaddi sandstones above. Like the other miocene beds below 

 it contains numerous pieces of gypsum and it gradually passes into 

 the underlying strata. The thickness of this sandstone even within 

 the limits of this small area varies very greatly, and where the Thi ho 

 Yo Chaung in block 3S crosses the boundary of the miocene beds it 



( 59 ) 



