56 VREDENBURG : RECENT ARTESIAN EXPERIMENTS IN INDIA. 



The following list of the strata met with has been kindly comma* 

 nicated by the Engineer-in-Chief of the East Coast Railway : — 



Section of Artesian Well boring at Coconada Town. 



Number 



of 

 stratum. 



Thickness 



of 



stratum. 



Total depth 



from top of 



spoil bank. 



Description of strata. 





Feet. In. 



Feet. In. 





1 



10 



10 



Sand. 



2 



20 



30 



Clay. 



3 



80 



no 



Clay and a few pebbles, then clay and sand, 



4 



30 



140 



Clay. 



5 



10 



150 



Sand. 



6 



70 



220 



Clay, then decomposed rock. 



7 



10 



230 



Sand and soft sandstone. 



8 



48 



27a 



Clay. 



9 



1 



279 



Decomposed rock and coarse sand. 



10 



I 



280 



Disintegrated rock. 



11 



9 



2S9 



Coarse sand. 



12 



1 



290 



Sand conglomerate. 



13 



1 9 



291 9 



Sand. 



«4 



3 



292 



Soft sandstone. 



IS 



3 ° 



295 



Sand. 



Tank spoil bank level about 3 feet above ground-level. Water 

 level in pipe at a depth of 1' 6". Diameter of bore-hole, 8£ in. Total 

 depth of lining 290 feet. 



An experimental boring is being conducted at present in another 

 part of the alluvial deposits of the Godlvari at Ellore. But as it 

 seems certain that it is at present in Gondwana rocks, it will be 

 ( 56 ) 



