STRUCTURE OF ILLIONIAN DRIFT BORDER. 263 



In Beanblossom Valley near Needmore, Ind., the wells reach a depth 

 of about 50 feet, and the material penetrated is Said to be in the main 

 similar to that at the surface, a very stony, almost gravelly, till of brown 

 color. 



In East White Valley wells are seldom 50 feet in depth, and are 

 largel)^ through sand and fine gravel. This is probably referable in the 

 main to the Wisconsin stage of glaciation. On the lowlands west of the 

 valley the wells ordinarily penetrate 8 to 10 feet of pebbleless clay, beneath 

 which they enter till. Beds of gravel associated with the till furnish a 

 supply of water. 



At Seymour, Ind., on a low sandy plain east of White River Valley, 

 the wells are driven through sand and sandy clay to a depth of 50 feet or 

 more without encountering a stony clay. The deposits may be alluvial 

 rather than glacial. A gas-well boring penetrated 75 feet of Pleistocene 

 deposits, as follows: 



Section of Pleistocene deposits in a gas horing at Seymour, Ind. 



Feet. 



1. Coarse sand 12 



2. Very fine sand or silt, almost a clay 43 



3. Black muck, probably an old flood plain of the river 10 



4. Coarse sand with a large amount of water 5 



5. Blue clay ,5 



Total 75 



The black muck of this section is often found in the vicinity of Sey- 

 mour at a nearly uniform altitude, and seems likely to be an old flood 

 plain over which sand and silt have been deposited, either by water or by 

 wind. A short distance east from Seymour the rock comes up to a level as 

 high as the well mouth. 



On the plain bordering Chestnut Ridge south from Seymour, water is 

 usually obtained at a depth of 30 feet or less, though a few wells are as 

 deep as 40 feet. The wells are mainlj^ through fine sand or clay, yellow at 

 top but of blue color at a depth of 16 to 18 feet. A flowing well on this 

 plain is reported by Cox to obtain water in a soft shale beneath alluvium 

 and drift at a depth of 27 feet. The well is located on a branch of Pond 

 Creek, in sec. 7, T. 4 N., R. 5 E., a few feet below the general level of the 

 plain. 



The following sections of wells were obtained on Chestnut Ridge. 



