PLIOCENE BEDS. 45 



hills the basal Irrawaddi beds are wanting, and we have, at the base, 

 sandstones like those higher up in the series on the other side of the 

 hills. 



To the east and west of the exposure of Yenangyaung beds, 

 n .. . , , ,,. and resting on them unconformably, as we 



Pliocene beds, Irrawaddi ° J ' 



series. have seen, are the Irrawaddi beds. On the 



eastern side of the anticline they dip towards the east at angles 

 varying from 6o° to go°, and on the western side at angles varying 

 from 20° to 25 . The area, on the east side of the hills, in which 

 they are exposed, is quite narrow, as south of Singu they become 

 covered up by recent deposits at the foot of the hills ; then along the 

 southern part of the Tangyi hills, to within 2 miles of Yenangyat, 

 they are not present, and the miocene beds extend to the Irrawaddi* 

 but from this place to the north there is a narrow strip of them, which 

 at Yenangyat and Seikkwa is bounded by the Irrawaddi, and farther 

 north their area, to the west of Mitchi, is again bounded by flat alluvial 

 country. On the western side of the hills they cover a large area, 

 and their exposure extends for a great distance into the Yaw 

 country. The Irrawadi (pliocene) beds are soft, whitish and yellowish 

 sandstones, full of fossil wood and calcareous concretions, and 

 containing layers of ferruginous conglomerate. The basal band 

 of conglomerate is not so constant here as at Yenangyaung, 1 and 

 in the country south of Singu it is almost entirely wanting, there 

 being only small patches of it ; farther north, however, in the 

 Yaw valley, west of the Tangyi Hills, it is more prevalent, and 

 here again it is found as a fairly constant band, although very 

 variable in thickness, running along the boundary between the 

 miocene and pliocene. Dr. Noetling 2 has made a zone of this 

 band of conglomerate, but I am inclined to include the next 150 

 or 200 feet of sandstone in the basal zone, as they contain inter- 

 stratified layers of ferruginous conglomerate, in which I have found 



1 Memoirs, G. S. I., Vol. XXVII, Pt. 2, p. 59. 



2 Ibid, p. 55- 



( 45 ) 



