THE PAST AND FUTURE OF NIAGARA. 



571 



Figs. 4. 



15 



Map of the Region or Niagara Falls. 



1. Strawberry Island ; 2. Beaver Island ; 3. Tonawanda Island ; 4. Cayusra Island ; 5. Brockton Island ; 6. 

 Navy Island; 7. Goat Island ; 8. American Fall ; 9. Horseshoe Fall; 10. Gas Spring ; 11. Oldest Terrace; 

 12. Whirlpool ; 13. Preglacial Channel; 15, 15. Line of the Escarpment; N. New Suspension Bridge; 

 O. Old Suspension Bridge; F. Fast Ground; 16, 17. Position of the Falls when the shale shall dip 

 below the river-bed, and the limestone shall form the entire precipice. After receding so fur, the Falls 

 will then wear away into cascades and rapids. IS. The Old Barrier. 



