YENANGYOUNG. 105 



capped by a bed of clay, was found at 268 feet from the surface or 

 200 feet above sea level. 



Well No. 47 has already been discussed, its section above the 

 petroliferous sand bears the strongest resemblance to that of the former 

 two wells only that the argillaceous beds predominate, while in the 

 former the arenaceous beds are thicker. A remarkable change takes 

 place in the sequence of the beds passing from No. 47 to No. 10, 

 a distance of 460 feet in a straight line. Below the beds of the 

 Yenangyoung series, a series of 162 feet follows, described as "soft 

 grey sand and slate/' which rest on 20 feet of inferior oil-sand. It is 

 difficult to find out whether argillaceous beds intervened; it may be 

 probable, inasmuch as the term "slate" seems to indicate this, but 

 it seems to be almost certain that they were of no importance. 

 I interpret this sequence of strata as the series of thin beds of clay 

 alternating with sand, which is exposed in the Aungban-yo, well 

 developed on the eastern side of the petroliferous tract. The oil- 

 sand was met with at 305 feet from the surface or 147 feet above 

 sea level. 



Dwelling for a moment on the results of these four, wells we 

 note that the top of the petroliferous sand was found in— 



No. 64 (a) 20 47 10 



at 170 200 200 147 feet above sea level. 



It rises therefore from No. 64 (a) in the direction of 20, keeps on 

 the same level between 20 and 47 and falls rapidly towards 10. 



{c) Section XVIII, pi. XIII, wells Nos. 19, 47, 6, A, 36. 



Well No. 19 represents a remarkable set of beds ; immediately 

 below the Yenangyoung series follows a rather thick series of sandy 

 strata with probably argillaceous parting somewhere near the base, 

 although the register is inaccurate in this respect, stating only that 

 soft "grey sand and clay" were found between 95 and 210 feet from 

 the surface, but whatever the thickness of this argillaceous bed may 

 be it is clear that it cannot be great, and that No. 19 is therefore 

 in accord with Nos. 66, 64, 20, 21 as shown by the preponderance of 



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