THE HISTOKY OF THE NIAGARA RIVER. 



25: 



Plate VII.— Chart of the Cufk Line at the hkai> of the Magaka 

 Gorge, compiled to show the Recession from 1842 to 18S6. 



^^8l;>''''''iJ,Tr^''"°^*"l ''?®.: f^'^ "*" ^''^'' f"?*^ ''!''*' ''^ mapped by N. T. State Geol. S.nvey in 

 184_. Full hue crest ot tails as uiapped by tbe U. S. Geol. Survey in 1886, witb olber fea- 

 tures as mapped by the U. S. Lake Survey in 1875. ' ' 



