YENANGYOUNG. 



107 



must be mentioned that the boring register of No. 46 which should 

 fall into this region, exhibits nothing unusual. However, the question 

 must remain open for the present until the deep wells drilled in the 

 Twingon tract shall give further indications as to the way these indi- 

 cations ought to be followed up. 



We must therefore content ourselves to assume that it has been 

 unquestionably proved by two sections drawn at almost right angles 

 across the northern end of the Kodoung oil tract, that the top of the 

 3rd oil-sand rises towards the centre, or, in other words, from the 

 poor and indifferent wells to the rich well No. 47. In a third direc- 

 tion this has been almost proved to a certainty. The result of the 

 above argument is that the northern end of the Kodoung petrolifer- 

 ous tract must form an irregularly shaped dome probably slightly 

 elongated in north-east to south-west direction, the centre of 

 which is occupied by a rich well and the outskirts by wells gradually 

 decreasing in productiveness. So far the object of proving the 

 series of intersecting folds has not been much advanced, but a section 

 along the western side of the petroliferous tract ought to show 

 whether there exist such undulations as supposed, and whether, 

 this is the chief point, these undulations correspond to the ridges 

 and bases of the intersecting folds. 



The section connects wells Nos. 66, 19, 1 1, 18, 22, 12, 43, 58, 27 

 and 26 and in order to avoid unnecessary length of description it 

 will be best to enter at once into the discussion of the upper level 

 of the 3rd oil-sand, and to deal with the upper beds conjointly after- 

 wards. Beginning at the northern end the 3rd oil-sand has been 



found at the follow 



ing 1 



evel 



5 : — 















No. 66 



. . 140 



feet 



above 



sea 



level. 



No. 19 











140 



»> 



i) 



ii 



11 



No. 11 











170 



)) 



B» 



11 



ii 



No. 18 











170 



t> 



91 



» 



IP 



No. 22 











i95 



)> 



I) 



>> 



it 



No. 12 











160 



II 



i» 



n 



II 



No. 43 











217 



» 



1. 



11 



3D 



No. 25 











230 



)> 



tl 



9f 



ro 



No. 58 











187 



., 



II 



19 



19 



No. 27 











198 



n 



i> 



II 



IP 



No. 26 



• 









210 



l> 



V 



l> 



5? 



( 153 ) 



