225 

 PHYSIOGRAPHY. 



Springs. 



The springs of the area are to be foiiud mostly in the limestone 

 regions. They owe tlieir origin to underground drainage. None are min- 

 eral springs so far as the writer knows. They furnish the water supply 

 for the city of Bloomiugton and supply the water for domestic uso 

 throughout the region where they are found. 



Abandoned Swamps. 



About three-quarters of a mile north of the Lemon schoolhouse, on 

 the top of the north bench of EUet's hill, is a deposit of iron ore gravel. 

 This limonite is scattered over a large area and is evidence of the exist- 

 ence of a large swamp which has now dwindled down to a pond. This 

 swamp probably dates back to glacial times. It was most likely formed 

 between the foot of the ice-sheet and the ridge that terminates Ellefs hill 

 at the south. 



Salt Licks. 



Several salt licks are to be found in Indian Creek and Bean Blossom 

 valleys. They seem to be evidence of saline shales beneath the valley 

 floors. 



Boulders not Glacial in Origin. 



In a ravine just north of Ellet's hill, about a mile northwest of Lemon 

 Post Office, are several large bowlders some of which will weigh several 

 tons. These bowlders are not glacial in origin because they are neither 

 scratched nor worn, but are large concretions weathered from the adjacent 

 sandstones of the ravine. That this conclusion is correct is attested by the 

 fact that a half-weatheredout concretion of large size is in situ project- 

 ing from the sandstone wall of the ravine near by. The concretions are 

 largely composed of silica and are very hard.* 



Lost Ridges. 



Standing in line with a point between White River on the left and 

 Bean Blossom Creek on the right in section 5, Bean Blossom Township, 

 is a subcircular knob called Indian or Pasture Mound. This mound being 



•In the vicinity of these bowlders were several granite bowlders of glacial origin. 

 15— A, OK Science, '03. 



