DETAILED ACCOUNT OF SOME RECENT EXPERIMENTS. 



5' 



direction. A boring was put down by private enterprise through 

 these strata in the year 1883, near Ennur. A water-bearing stratum 

 was struck at a depth of 65 metres (213 feet). There does not ap- 

 pear to exist any detailed record of the boring : it reached a depth 

 of 214 feet in September 1884, but by that time it had proceeded 

 beyond the alluvium and had penetrated the underlying tertiary and 

 Jurassic beds. 



In June 1886, a boring was commenced at Government expense 

 at Karani in the Kortalayar valley. The result 



The Karani boriner. , . . , . , , . r . 



was disappointing as only two sheets 01 water 

 were met with at depths of ten and forty feet, neither of which 

 were very abundant. The boring was continued to a depth of 442 

 feet without striking any other supply. The list of strata encountered 

 is given below. According to Mr. Foote it is doubtful whether all 

 these strata belong to the recent alluvial deposits of the Kortalayar 

 and Pildr. Just as in the experiment at Ennur, it is possible that 

 the lower part of the boring has been sunk through rocks older than 

 the alluvial, in the present case the " Cuddalore sandstone " of ter- 

 tiary (or pleistocene) age. 



Section of the Karani boring. 



Number 



Thickness 



Depth 





of 

 stratum. 



of 

 stratum. 



below 



ground-level. 



Description of strata. 





Feet. 



Feet. 





1 



4 5° 



4'5° 



Sandy vegetable mould, yellowish, then black 

 clay with a small portion of sand. 



2 



2-50 



7 00 



Fine yellowish sand with a few pieces of kankar. 



3 



4 - oo 



1 roo 



Greyish sand with a little clay and pieces of 

 kankar. Water sheet at 10 feet. 



4 



2'00 



13-00 



Fine yellowish sand with some kankar. 



( 51 > 



