66 PASCOE: GEOLOGICAL NOTES ON MESOPOTAMIA. 



below. Such radial cracking along the crest of an anticline is com- 

 mon and natural, the cracks being rilled with calcite, gypsum, mud, 

 etc. I have seen less promising areas than this tested in Burma. 

 Drilling in this area would have to be deep and would be a pure 

 gamble until more is known of the general " lie " of the oil supplies 

 in the country and also until the Jabal Hamrin itself has been more 

 extensively examined. 



20th April, 1919. 



FINAL SUMMARY REPORT. 



Introduction. 



In the series of reports written during the process of this survey, 

 I have put forward freely opinions and hypotheses as they gradually 

 developed with the work. It is now proposed to review briefly 

 some of the points and to summarize the extent to which these 

 opinions and suggestions have been confirmed or modified. No 

 radical change of opinion was found necessary, but the scheme of 

 classification naturally expanded and the theory of unconformity 

 was tested. 



Unconformity. 



In Reoort No. 2 it was stated that, in view of the marine charac- 

 ter of the Jabal Hamrin Fars series and the fluviatile nature of the 

 succeeding red clays and sandstones of the Kurd series, and also 

 in view of the correspondence in character of these Fars beds with 

 Dr. Pilgrim's gypsum-bearing Lower Fars on the one hand, and the 

 red clavs and sandstones with his Bakhtivari series on the other, 

 the boundary between the two series in the Jabal Hamrin might be 

 an unconformity, and possibly one of some magnitude locally. It was 

 also stated that an extended examination of this boundary in other 

 areas would be necessary to prove this one way or the other, and 

 that there was no evidence at all in the portion of the Jabal Hamrin 

 investigated, to prove that this unconformity was anything more 

 than the break consequent on the change from a marine gulf to a 

 river. It has been found possible to extend the last statement to 

 all areas subsequently surveyed. The top bed of the Fars varied 

 in nature from a f ossiferous limestone to a gypsum band, but to 

 what extent this was due to lateral variation or to unconformity, it 

 would be difficult to say ; the impression gained was that this break 



