36 GRIMES ! MVINGYAN, MaGWE AND PAKOKKU DISTRICTS. 



From an examination of the boring records we see that the beds 

 vary very greatly in thickness and character within a comparatively 

 short distance, shales replacing sandstones and sandstones shales 

 and fresh beds coming in or others dying out. So rapid is this 

 change that no two records of bores, however close together, are the 

 same, and I have only with difficulty been able to correlate the beds 

 shown by the boring records of the wells, on the hills to the south of 

 the Yenan-C Chaung at Yenangyat, with those of the wells on the 

 hills to the north of that Chaung. Notwithstanding this rapid change 

 we see that there is a fairly regular succession of beds, and the 

 following would be a typical section, the thicknesses given being the 

 average of those observed in the wells : — 



Sand . 









30 feet. 



1st oil sand. 



Shale . 









50 „ 





Sand . 









21 „ 



2nd oil sand. 



Shale . 









27 >, 





Sand . • 









16 „ 



3rd oil sand. 



Shale . 









24 „ 





Sand • , 









10 „ 



4th oil sand. 



Shale . , 









54 » 





Sand . . 









20 „ 



5th oil sand. 



Shale . , 









76 „ 





Sand . , 









40 » 



6th oil sand. 



Shale • 









, 60 „ 





Sand • , 









75 m 



7th oil sand. 



Shale . 









32 „ 





Sand . . 









20 „ 



8th oil sand. 



Shale . 









45 „ 





Sand . 









23 „ 



gth oil sand. 



Shale • 









35 ., 





Sand . 









9 ; 



loth oil sand. 



Shale . 









. 18 „ 





Sand • 









20 „ 



nth oil sand. 



Shale . 









9i >j 





Sand • 









10 „ 





Shale . 









25 „ 





Sand w 









15 .. 



12th oil sand. 



Shale . 









13 >, 





Sand . 









39 » 





Most of the sandstone beds near the centre of the anticline at 

 ( 36 ) 



