GEOLOGICAL AlSfD NATURAL HISTORY SURVEY. 69 



west from the railway station, and at an elevation 55 to 60 feet 

 above the lake. 



Near the mouth of the Kalamazoo River, in Michigan, there 

 are extensive sand plains standing 90 to- 100 feet above the lake, 

 which seem to have been occupied by lake water. The sand de- 

 posits extend back nearly to Allegan, on the Kalamazoo, and 

 southward from the Kalamazoo to Paw Paw River, near 

 Hartford, occupying a strip of lowlands back of a moraine that lies 

 near the lake shore. They may have been formed at an earlier 

 stage than the beach under discussion, in a narrow lake held be- 

 tween the ice and the higher land to the east. It seems probable 

 that a small lake would have appeared during the formation of this 

 moraine. In the present stage of investigation it is scarcely legiti- 

 mate to assume that Lake Chicago reached so high a level there, 

 a level about 40 feet above that of the beaches at the south and 

 west borders of the lake. 



There is very little range of altitude shown in the Illinois por- 

 tion of this beach, the variations being scarcely more than may be 

 attributed to the fluctuations in the lake or to storms. The follow- 

 ing presents the railway elevations in succession, from north to 

 south, at points where this beach is crossed : 



Table of Altitudes along the Upper or Glenwood Beach. 



In the above table, where two elevations are given, the lower 

 marks the base of the cut terrace and the upper the brow. It is 

 probable that the lake level was but a few feet above the base. In 

 the Illinois portion it may safely be assumed to be 635 to 640 feet 

 above tide or about 53 to 58 feet above the level of the present lake. 



