BULL. GEOL. SOC. AM. 



VOL. 16. 1904, PL 17 



FrouRE 9.— Lockport Limestone, Lockport, N. Y. 



Tlie limestone is at crest of Niagara escarpment. The derrick stands on perfectly preserved glaciation. At th 



left is seen higher and corroded beds 



Figure 2. -Lockport Limestone near Rochesteb 

 Showing the deeply corroded dolomitic limestone 



FAILURE OF ICE EROSION ON LOCKPORT LIMESTONE 



