YEN ANG YOUNG. 1 09 



Further, the theory requires the existence of a ridge between 

 Nos. 18 and 12, on the top of which the rich well No. 22 is situated. 

 There could hardly be anything more conspicuously expressed than 

 is the presence of this ridge by the run of the top of the 3rd oil-sand ; 

 note the rise from 18 towards 22 and the quick drop from 22 

 towards 12. 



Passing along this subterraneous ridge in a westerly direction we 



come to well No. 16, where the top of the 3rd oil-sand has been 



found at 180 feet above the sea level, thus indicating a fall in the 



height of the ridge. 



Another ridge must be assumed between Nos. 12 and 58 ; nothing 



seems better demonstrated than this by the section exposed by 

 drilling wells. Again we observe that the richest wells are situated 

 on the highest point, following the direction of the ridge towards 

 west, we observe that in well No. 14 the top of the 3rd oil-sand is 

 only 130 feet above sea level. 



A sag is supposed to exist between Nos. 43 and 27 as shown by 

 the rise which exists between wells Nos, 58 and 25. 



The ridge on which wells Nos. 27, 28, 26, 48 are situated is 

 proved to a tolerable certainty, but not so the sag following imme- 

 diately south of it. 



It exists most probably because from well No. 26, where the top 

 of the oil-sand is met with at 210 feet above sea level, there is a 

 decided fall towards the indifferent well No. 31 where it was found 

 at 200 feet above sea level. Following up the direction of this ridge 

 in a westerly direction towards wells Nos. 29 and 28, we may observe 

 again the usual fall in the level of the top of the 3rd oil-sand. 



In No. 28 it was found at 170 feet above sea level, whilst 

 at No. 29 it was only 155 feet It appears, therefore, that the 

 richest wells have been found to be situated at such places where the 

 petroliferous sand rises highest to the surface, and the poorer wells 

 are found in places towards which the 3rd oil-sand slopes from richer 

 localities. 



When examining the younger strata in the boring registers we 



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