98 







; 



. ^ 



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• . 





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Plate 53.— Classification: SYSTEM Palustrine, class Unconsolidated Bottom, SUBCLASS Mud, water REGIME Semipermanently 

 Flooded, water chemistry Fresh- Alkaline, SOIL Mineral, special MODIFIER Impounded. A sparse stand of water plantain (Alisma 

 plantago-aquatica) appears along the edge of the impoundment. (Billings County, North Dakota; July 1970; Photo by J. T. Lokemoen) 



