88 



Plate 43.— Classification: system Lacustrine, SUBSYSTEM Littoral, class Unconsolidated Shore, subclass Sand, water REGIME 

 Intermittently Flooded, water chemistry Fresh. Water levels in the Great Lakes generally fluctuate little during a single year, 

 but they may rise and fall considerably over a period of several years. The water level in Lake Michigan was at an all-time high 

 when this photo was taken. As a result of long-term changes in lake levels and seiches produced by storms, lake waters inundate 

 part or all of this beach on an irregular basis. (Indiana Dunes National Lakeshore, Porter County, Indiana; May 1985; Photo 

 by F. C. Golet) 



