62 grimes: myingyan, magwe and pakokku districts. 



measured a greater thickness than the 4,530 feet, which Dr. Noetling 

 measured at Yenangyaung. 1 



Owing to the uniformity of the series it is impossible to definitely 



divide it into zones, but an examination of the 



Division of th© irra- \> e d s shows that certain characters are more or 



waddi into four zones. 



less confined to different horizons, of which I 

 have distinguished four. It is, however, impossible to map these as 

 they pass gradually into one another so that no boundary between 

 them can be distinguished. The following are the horizons in ascend* 

 ing order, but as I am not acquainted with the uppermost beds of 

 the series there are probably higher zones :—~ 



Zone 1. Sandstones with numerous bands of ferruginous conglomerate con- 

 taining vertebrate remains. 

 „ 2. Sandstones with large rounded concretions and much fossil wood. 

 „ 3. Sandstones with numerous small root-like concretions and little fossil 



wood. 

 ,, 4. Sandstones with ferruginous conglomerate and much fossil wood. 

 Zone I. The lowermost zone consists of the ordinary yellowish 



white sandstones containing numerous pieces 

 The lowermost zone. , r .. , - ., . , .. - . . 



01 iossil wood and it is tull of very hard concre- 

 tions which are both calcareous and silicious, and these are either in 

 globular or mammilated masses or in definite layers in the sandstone. 

 Pieces of the concretions and of the fossil wood are everywhere seen 

 lying on the surface of the ground. Scattered through these sandstones 

 are numerous layers of red ferruginous conglomerate, which with the 

 exception of the basal bed are very inconstant and rapidly die out 



-."'■' J , when traced in any direction. The basal band 



The basal conglomerate J 



band. f conglomerate is fairly constant within the area 



of the Yenangyaung oil-field and is very conspicuous ; it varies some- 

 what in composition and greatly in thickness within a short distance, 

 and at one place in the southern part of the Yenangyaung oil- 

 field it dies out entirely for a short distance. Dr. Noetling has 

 mapped 2 this as a separate zone, and as my work on the southern 

 part of the Yenangyaung oil-field was a continuation of his, 



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



= Memoirs, G. S., I., Vol. XXVII, Pt, 2, Map. 



( 62 ) 



