X. A, 3 



Smith: Geology of Pa'nay 

 Log of Well No. 161, Iloilo, Iloilo. 



219 



Depthin 

 feet. 



- 



Strata. 



Drillers' classification. 



Remarks. 



0- 80 



80- 90 

 90- 100 



100- 110 



110- 130 

 130- 150 

 150- 170 

 170- 190 

 190- 210 

 210- 300 

 300- 400 

 400- 500 

 500- 600 

 600- 650 

 650- 675 

 675- 710 

 710- 800 

 800- 910 

 910- 920 

 920- 975 



975-1, 100 

 1,100-2,285 



Shale with numerous shale fragments and 



small gravel. 

 Finer shale slightly calcareous 



Fine quartz fragments; resembles 



loam. 

 Result of disintegration of basic 



rock. 



Finer grrained. 

 Do. 



Similar to previous strata. 



Much the same as from 910 to 920 

 feet. 







Gray calcareous shale - . 



Same as 90 to 100 feet 



do 









Shale, strongly calcareous _.. 



Fine-grained shale 



Shale 







Adobe 



Sand, but not so good as from 650 to 675 feet . 

 Adobe 





do 



Marl - ._ 



Fine-grained marl- 





A discussion of the ground-water resources will be found on 

 page 226. A noteworthy point in connection with the wells sunk 

 in these shales is that the water obtained was salty. Mr. Pratt 

 in his manuscript report has given the following satisfactory 

 explanation of the brackishness of the water : 



If one accepts the most probable explanation of the presence of salt and 

 other minerals in the upper clay and shale, i. e., that they came from the 

 sea water in which the beds formed and are, consequently, original con- 

 stituents of the series, it is clear that the effect of ground waters, active 

 since the elevation of the land above sea level, would be a leaching out of the 

 soluble salts. 



I see no reason for thinking that the salt water has come from 

 the sea. Any flow of water depends upon head, and the flow 

 normally is from the land into the sea rather than vice versa. 



Rapidly changing conditions of sedimentation must have 

 existed throughout the formation of these beds. The thinness 

 of certain beds, the repeated alternation in character of the 



