92 PLEISTOCENE OF INDIANA AND MICHIGAN. 



Owen reports the following section of a well at the Baptist College, which stands on a 

 low gravel ridge in Franklin : 



Record of 'well at Baptist College, Franklin, Ind. 



Feet. 



Sand and gravel ... 16-18 



Till, blue ±40 



Sand, fine 2 



Till, blue (probably pre-Wisconsin) 50 



Gravel , 4 



114 



A well on the slope of Donnells Mound in sec. 8, Franklin Township, at a level about 40 

 feet above the base of the mound, has a depth of 50 feet. It passed through no till, but pene- 

 trated gravel to 35 or 40 feet and then entered sand. 



Wells in Shelby County, in the vicinity of the bowlder belt, in places reach rock at 50 

 feet or less. The drift is largely a blue till. Some wells pass at about 30 feet from a soft into 

 a hard till, which is thought to mark the top of the pre-Wisconsin drift. In central and western 

 Rush County most wells reach rock at 50 to 75 feet, though one near Manilla, as reported by 

 Collett, 1 penetrated 93 feet of drift, as follows: 



Section of Arbuckle & Mills boring vest of Manilla, Ind. 



Feet. 



Soil and clay 5 



Quicksand 3 



Clay, blue 5 



Clay and gravel : 3 



Bowlder clay 17 



Sand and gravel 3 



Bowlder clay, blue 57 



93 



At Rushville the drift may exceed 100 feet in depth on the moraine north of the city, 

 for rock is struck at 40 to 90 feet on the plain east of the moraine. The drift on this plain and 

 apparently also on the moraine is mainly till. 



At Hamilton station a gas well penetrated 92 feet of sand and then 55 feet of hard blue 

 till before striking rock. 



OUTER BORDER. 



The only gravelly outwash noted along the entire chain of moraines is found in the northern 

 part of Rush County in the vicinity of Raleigh. The gravel is spread out over a width of about 

 2 miles for a length of 5 or 6 miles along the eastern base of the moraine. Several flowing 

 wells about a mile northeast of Raleigh show that the gravel is shallow, for they are mainly 

 through till and obtain water from the sand bed beneath the till at depths ranging from 65 to 

 about 100 feet. A well hi Raleigh 80 feet deep has ahead within a foot or two of the surface. 



INNER BORDER. 



TILL PLAIN. 



For some miles back from the undulating strips there is a till plain with scattered knolls, 

 few of which exceed 10 feet in height. This plain rises toward the northeast hi Montgomery 

 and Boone counties and within a short distance reaches an elevation considerably higher than 

 that of the moraine. In Hendricks County it descends eastward from the moraine. In Johnson 

 County it rises very gradually northward from the moraine, and in the district east of East 

 White River it generally descends from the moraine toward the river across the inner border 

 district. These slopes are not controlled entirely by the altitude of the underlying rock, for 

 the ascent hi Johnson, Boone, and Montgomery counties is due to a thickening of the drift. 



i Eleventh Ann. Rept. Dept. Geology and Nat. Hist. Indiana, 1881, pp. 64-65. 



