MAIN MORAINIC SYSTEM OF THE MIAMI LOBE. 371 



At New Madison there are outcrops of rock in the valley of White- 

 water River, but the gas well, which is also in the valley, penetrated 75 

 feet of drift. 



The only records of deep wells obtained in the Indiana portion of this 

 moraine are at Lynn and Losantville. In Lynn one gas well has 117 feet, 

 the other 124 feet of drift. In each well there is about 50 feet of till at the 

 surface, beneath which the drift is mainl}^ gravel. In Losantville the cbift 

 has a thickness of 240 feet, the greater part of which is blue till. Some 

 gravel beds were passed through within the upper 100 feet. 



BOWLDERS. 



Frequent references have already been made to the large number of 

 bowlders which characterize the middle member of this morainic system. 

 Reports by earlier observers, Orton, Hussey, Chamberlin, and Phinney. 

 contain descriptions of portions of the belt,^ and Chamberlin recognized it 

 as an accompaniment of a moraine of the Miami lobe There are few, if 

 any, bowlder belts within the drift-covered portion of the Mississippi Basin 

 which exceed it in strength and extent of development There is scarcely 

 a mile along the whole length of the morainic loop, from the northern end 

 of the eastern limb in central Logan County, Ohio, around to the northern 

 end of the western limb in Henry County, Ind. (a distance of about 120 

 miles), in which bowlders are not a conspicuous feature. The belt has an 

 average breadth of more than a mile, not including the eastern limb, in 

 which its breadth is much greater, averaging 2 to 3 miles. The bowlders 

 are much more plentiful in some localities than in others. An estimate 

 made from an actual count of the bowlders at several points gives an 

 average of about ten surface bowlders per acre whose size exceeds 1 foot 

 in diameter. Professor Orton noted a field near West Alexandria, in Preble 

 County, where by actual count there are over 1,200 bowlders per acre 

 which exceed 2 feet in diameter. The aggregate number in any portion of 

 the western limb is probably as great as in an equal length of the eastern 

 limb, since the bowlders are dropped in greater numbers per unit of area in 

 the former than in the latter situation. 



The size of the bowlders ranges from a cubic foot or less up to 1,000 



1 E. Orton, Geology of Ohio, Vol. Ill, 1878, pp. 412-414; John Hussey, Geology of Ohio, Vol. Ill, 

 1878, pp. 475-476; T. C. Chamberlin, Third Ann. Rept. U. S. Geol. Survey, pp. 334-335; A. J. Phinney, 

 Fifteenth Ann. Kept. Geol. Survey Indiana, 1885-1886, pp. 112-115. 



