STRUCTURE OF ILLIONIAN DRIFT BORDER. 265 



Wells in Dudleytowu, also on a low part of the ridge, obtain an 

 abundance of water at less than 60 feet. Henry King's well, on the slope 

 of the ridge south of Dudley town, perhaps 30 feet above the level of the 

 border plain, reaches a depth of 63 feet. John W. Collins's well, near the 

 south end of the ridge, at an altitude nearly 100 feet above the plain, 

 obtains water at 50 feet. A log was penetrated near the bottom in a sandy 

 blue clay. 



In the vicinity of Mount Sidney, on the borders of the Muscatatuck 

 River, wells are obtained at 40 to 45 feet in sand and gravel below till. 

 The water bed is apparently a little higher than the level of the river. 



Along the Ohio Valley several wells penetrate to a level considerably 

 below the Ohio River before striking rock, and these probably in some 

 instances pass through drift of Illinoian age. C. E. Siebenthal reports that 

 at Utica, Indiana, a well standing on ground 40 to 50 feet above the Ohio 

 River reached a depth of 120 feet before striking rock, while several wells 

 west from Jeflfersonville penetrate to a level lower than the river without 

 striking rock. They are mainly through sand and gravel. Siebenthal 

 holds the opinion that the Ohio may have formerly had its course through 

 the north edge of the valley back of Jeffersonville.^ 



• At Madison, Indiana, several wells have reached a dejDth of 120 feet 

 without entering rock, but they are on a terrace standing about 100 feet 

 above the river. The terrace seems to be of Wisconsin age, but there may 

 be gravel and sand of Illinoian age under the Wisconsin gravel. The wells 

 are reported to be entirely through sand and gravel. 



At Carrollton, Ky., a boring at Jett's distillery, which stands near the 

 mouth of Kentucky River about 60 feet above the low-water level of the 

 river, reached a depth of 107 feet without entering rock. It teiTninated in 

 a conglomerate which appears to be similar to that found in the banks of 

 the Ohio above Carrollton, and which, like that conglomerate, is probably 

 of Illinoian age. 



Near Vevay, Ind., cemented gravel, which may be Illinoian, appears 

 under loose gravel of Wisconsin age. The village of Vevay stands on a 

 terrace about 80 feet above the Ohio, and wells are usually obtained at 

 depths of 60 to 80 feet. 



The Split Rock and associated conglomerates near Aurora, Ind., have 



1 Twenty-fifth Ann. Kept. Geol. Survey Indiana, 1900, pp. 3.59-364. 



