BULL. GEOL. SOC. AP 



VOL. 16, 1904, PL. 19 





■ 



7 : ■ s^-^&Wt 



Figure 1.— Cornell quarry, Hulberton, New York 



Corroded sandstone layers disturbed but not remove) 



Figure 2. — Horah quarry, Medina, New York 



Corroded sandstone layers undisturbed 



FAILURE OF ICE EROSION ON MEDINA^PLAIN 



