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JAMES WALTER GOLDTHWAIT 



of Lake Algonquin — a great lake which occupied the Huron, the 

 Michigan, and part of the Superior basins, while the ice formed a dam 

 across low passes to the northeast. In the absence of direct observa- 

 tion south of Kewaunee, the plane of this Algonquin beach was 

 extended by inference so as to pass under the present lake near Two 



Fig. I. — Map of part of the Great Lake region. 



Rivers. Still later observations by Taylor and others, however, 

 pointed to the probability that the shore-lines become horizontal 

 above Lake Huron and Lake Michigan, encircling the southern ends 

 of both. 



In the southeastern part of the state and further south, around the 

 head of Lake Michigan, a series of beaches, studied in detail by Mr. 

 Frank Leverett, Dr. W. C. Alden, and others on the United States 



