Geology 



anticlines and thus indicate the lines for future 

 research. 



The location of the anticlines in this flat country 

 with few exposures was by no means an easy matter, 

 as many of the beds of rock strongly resembled one 

 another. 



We were able, however, to separate the rocks into 

 three groups, which we may call respectively the Lower, 

 Middle, and Upper Jurassic, though without further 

 work on the fossils we could not definitely state that 

 these agreed with the similarly named divisions of 

 Western Europe. 



It was near the base of the middle division that 

 the brown tarry sandstone occurred, so that any part 

 of the area where the surface consisted of the Upper 

 Jurassic, or the upper part of the Middle Jurassic, 

 might prove worthy of attention. 



Each of the three groups of rocks contained 

 characteristic fossils, which could be readily identified 

 in the field, and this made our work easier. Without 

 them it would indeed have been well-nigh impossible. 



The denudation which had taken place amongst 

 these rocks had not been very severe, and as a result 

 the tributary streams flowing along the strike of the 

 folds still occupied the synclinal hollows, while the 

 higher ground forming the subsidiary water-sheds lay 

 along the anticlinals. This fact enabled us to locate 

 two of the anticlinal axes in both of which the surface 

 layer consisted of the lowest bed of the Upper Jurassic, 

 from which we might conclude that the whole of the 

 oil-bearing series would be found below. The positions 

 and directions of these two lines were carefully deter- 



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