A RECONSTRUCTION OF WATER PLANES 



465 



and this line is extended east and southeast through Lake St. Clair 

 and Ashtabula, Ohio, so as to mark the corresponding limit for the 

 beaches of Lakes Maumee and WhittleseyMn the Erie basin, as 

 determined by Leverett and Taylor. South of this line, then, there 

 seems to have been no subsequent deformation in either the Michigan 

 or the Erie basins. 



Beyond Grand Haven, on the east side of the lake, the data 

 recently collected at several localities, as far north as Ludington, 



Fig. I. — Map of Lakes Michigan and Huron, showing northern limit of hori- 

 zontality of the beaches of Lakes Chicago, Maumee and Whittlesey, altitudes of the 

 Algonquin beach at selected localities, and isobases of deformation and line of maxi- 

 mum inclination of the warped Algonquin water plane. 



indicates that the beaches rise northward and increase in number; 

 but the precise correlation has not been possible for several reasons. 

 The measurements are as follows: 



Locality Distinct Beaches at 



Muskegon 604', 609', 6i3'-6i6', 628' 



Montague 632', 634', 656', 658. 



Bass Lake 628-630', 639', 642', 649-650'. 



Ludington and Amber 636'-64o', 673'-675'. 



The fragments north of Grand Haven are scarce and generally 

 obscure, becoming sandy and irregular as they go north. It appears 

 as if they were approaching the ice border for those stages, and fading 



