CORRELATIVES OF CHAMPAIGN MOHAINIC SYSTEM. 91 



30 feet to 300 feet or more. The drift pertaining to the Wisconsin invasion, however, may not 

 exceed 30 feet in average thickness, for the preglacial valleys were largely filled at earlier stages 

 of glaciation. 



Well data. — The Crawfordsville gas-well boring at the railway junction in the southeast 

 part of the city has the following drift section, as observed and reported by C. S. Beachler. It 

 is probable that the lower or hard bed of blue clay is of pre- Wisconsin age. 



Section of drift in Crawfordsville gas boring. 



Feet. 



Till, yellow 12 



Till, blue, soft 60 



Clay, blue, hard, mixed with gravel 64 



Gravel 4 



140 



About one-half mile east from Crawfordsville, in sec. 33, T. 19 N., R. 4 W., a boring 

 for natural gas penetrated 240 feet of drift; the surface is about 790 feet above sea level or 

 nearly the same as that at the well near Crawfordsville Junction. In the valley of Sugar 

 Creek in the north part of Crawfordsville, about 660 feet above sea level, a gas boring penetrated 

 150 feet of drift. About a mile north of this gas boring rock outcrops at an altitude of 750 

 feet or more. The change in the altitude of the rock surface within a mile is therefore about 240 

 feet. The rock surface rises southeast from Crawfordsville, reaching about 875 feet near New 

 Ross. 



In the north part of North Salem, Hendricks County, at an altitude about 910 feet above 

 sea level, a well penetrated 85 feet of drift without reaching rock, and in the west part of the 

 village one 70 feet deep stopped in drift. The gas well at Danville, which began on ground 

 estimated to be 25 feet lower than the depot (and 871 feet above sea level), penetrated 160 

 feet of drift, of which the upper 43 feet contained much gravel and the remainder was mainly 

 blue till. 



The following record of a gas boring was reported by Prof. D. A. Owen, of the Franklin 

 Baptist College : 



Section of drift in Franklin gas boring. 



Feet. 



Till, yellow and blue 40-45 



Sand ±20 



Till, blue, alternating with gravel, the till constituting about four-fifths of the material (probably 

 pre- Wisconsin) 100 



170 



A well at Mr. Burgess's residence, in Youngs Creek valley south of the courthouse at Franklin, 

 obtains a flow from a depth of 90 feet. A flow was also obtained in the gas-well boring from 

 about the same depth, and there is good evidence of a continuous sheet of water from one 

 well to the other, though they are about 300 yards apart, for the water from the Burgess well 

 became turbid soon after the gas boring began to flow. 



Several wells in the north part of Franklin along a small tributary of Youngs Creek obtain 

 flows from 40 to 45 feet, perhaps from between the Wisconsin and pre-Wisconsin drifts; and a 

 well at the water tank of the Cleveland, Cincinnati, Chicago & St. Louis Railway in the valley 

 of Hurricane Creek obtains a flow from about 30 feet. These shallow flowing wells probably 

 have no connection with the Burgess well. 



In the southeast part of Franklin, in the vicinity of the starch factory, several wells whose 

 depth is only 20 to 30 feet have a common source of supply, for when an attempt was made 

 to pump one dry the others to a distance of 75 to 100 yards from this well were lowered several 

 feet. There seems, therefore, to be a sheet of sand or gravel below the upper till. 



