398 THE ILLINOIS GLACIAL LOBE. 



The following- section of a well at the northern Indiana penitentiary, 

 near Michigan City, appeared in an early report of the Indiana geological 

 survey. 1 The well mouth is 16 feet above Lake Michigan and the water 

 will rise 22 feet above the surface. The well has an estimated discharge 

 of 300 gallons per minute: 



Section of well at northern Indiana penitentiary. 



Feet. 



Sand 48 



Clay 4 



Sand 24 



Blue clay 66 



Sand 30 



Shale 76 



Upper Silurian limestone 293 J 



Total 54H 



The following section was observed in the bluff of Trail Creek near a 

 mill in sec 34. T. 38 N., R. 4 W.: 



Section of bluff of Trail Greek. 



Feet. 



1. Brown saud with thin beds of pebbles 6 



2. Brown clay, nearly pebbleless, mainly noncalcareous, but with thin calcareous bands 3 



3. Brown sand 1 



4. Brown clay, similar to "No. 2" 1 



5. Yellow sand 6 



6. Laminated blue clay with few pebbles 10 



Total 27 



On the south border of Berrien County, Michigan, in sec. 19, T. 8 S., 

 R. 20 W., two wells 85 feet in depth are mainly through a soft blue till 

 containing but few pebbles. In that vicinity the blue till is often found 

 within 4 feet of the surface. On the ridge at Three Oaks wells usually 

 penetrate 6 or 8 feet of yellow till before entering the blue. Soft blue till 

 extends to a depth of 70 feet, and there water-bearing sand is usually 

 struck. 



At New Buffalo, Michigan, the blue till is frequently exposed at depths 

 of but 4 or 5 feet, and the wells in the higher part of the village usually 

 penetrate about 50 feet of blue till before striking a water-bearing bed. On 

 low ground near the shore of the lake flowing wells have been obtained at a 

 depth of about 30 feet. The drift at New Buffalo, as reported in an early 



' Geol. of Indiana, 1873, pp. 470-471. 



