

88" 





r 



87 







1 



860 





r 



85 



1 



840 





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58 59 60 

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62 



63 64 



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-450 



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440- 







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18 "^ 



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-430 





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19 

 20 

 21 

 22 

 23 

 24 



V 



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430- 







V" 



26^ 













-420 





'' 30 29 28 "^ 











420- 



25 









25 50(mi) 



50,000 









50,000 I00,000(m) 





880 





870 



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86° 



1 





850 



J 



840 



1 





Study sites at Lake Michigan. 



20 



