GEOLOGICAL AND NATURAL HISTORY SURVEY. 25 



State line being about forty to fifty feet, and its eastern end, near 

 South Bend, fully loo feet higher than the lake. 



The lake outlet trenches the Valparaiso moraine to a level 

 about as low as the surface of Lake Michigan, with a valley nearly 

 a mile in average width. This is the only drainage line crossing 

 the Valparaiso moraine in Illinois and no drainage line crosses 

 the moraine in Indiana, though it is crossed by the St. Joseph 

 River just north of the Indiana line between Niles and Berrien 

 Springs in Michigan. 



Some of the features just discussed are well represented on 

 the reduced topographic map accompanying this paper. But 

 the large map sheets of the United States Geological Survey 

 should be consulted for the full representation of characteristic 

 features of the plain, the outlet, and the Valparaiso moraine. It 

 is to be hoped that the map sheets of the entire State, which Pro- 

 fessor Rolfe has prepared, may soon be published, since they 

 bring out clearly the main pllysiographic features. 



