NIAGARA 



215 



from one published in Mr. Hall's "Geology of New York." 

 It is based on surveys executed, in 1842, by Messrs. Gib- 



Q O A T 



ISLAND 



Fro. 4. 



gon and Evershed. The ragged edge of the American Fall 

 north of Goat Island marks the amount of erosion which 



