VOL. IV 



MINNESOTA BOTANICAL STUDIES 



PART III 



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Fig L The underlying rock with the veneer of sandhills above. The stream is the 

 Middle Loup River in Thomas County. 



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Fig. 2. The sand is very commonly stratified. This shows a series of sand layers as 

 they are often exposed on the bare sides of blow-outs. 



PLATE XXVII 



