THE SHELBYVILLE MORAINE. 201 



It is probable that the lower elevation of the soil is due to its being formed 

 in an interg'lacial valley, though possibly it marks a lower horizon than the 

 base of the Shelbyville sheet. The soil contains much wood and mats of 

 decayed leaves. A spring issues from this soil bed which carries a small 

 amount of inflammable gas. 



An artesian well drilled by the Roman Catholic Sisters of Providence 

 at St. Mary's penetrates 100 feet of drift, of which the upper 75 feet is till 

 and the remainder clay and quicksand. The full section of the well to ;i 

 depth of 1,955 feet is published in the Twenty-first Annual Report of the 

 Indiana Geological Survey (p. 524). 



At Sanford, on the State line of Indiana and Illinois, the drift is found 

 to have a thickness of 147 feet. It is thought that only the upper 25 feet 

 belongs in the Shelbyville drift sheet. The following record, except the 

 parenthetical portions, which are added by the writer, appears in the Indiana 

 Geological Report for 1875 (p. 94): 



Section of drift in a well at Sanford, Illinois. 



Ft. in. 



Surface (yellow till) 15 



Sand 6 



Sand and clay 4 



Hardpan (Illinoian?) 66 



Brown clay 10 3 



Blue clay 8 4 



Sand -. 4 



Blue clay 37 6 



Total 147 5 



At Paris the waterworks well was sunk to a depth of 60 feet, of which 

 the upper 50 feet is till and the remainder sand and gravel. At the base of 

 the till considerable wood is found. It seems probable that the well extends 

 to the base of the Shelbyville drift sheet. 



At Charleston the distance to rock ranges from 30 feet or less to at 

 least 127 feet, a we'll in the north part of the city having reached no rock 

 at that depth. Along the Embarras Valley, south of Charleston, several 

 exposures were found in which the Illinoian drift, with the capping of white 

 clay, appears below the till of the Shelbyville sheet. The northernmost 

 exposure noted is a few rods west of the iron bridge, 3 miles southeast of 

 Charleston. At that point the Shelbyville drift sheet extends to within 

 about 20 feet of the river level. Near the south line of Coles County the 

 older (Illinoian) drift is found to reach an elevation 50 or 60 feet above the 



