BULL. GEOL. SOC. AM 



VOL, 10, 1898, PL. 13 



Fll. I KK 1. — 1.1 ANT SAXIVEiri'T.E 



Ocenrriiig in upper sandstone lens of the Medina formation at Loekport, Xew York, exposed in old 

 qiiarrj' west of the Indurated Filier Works 



Fic.;ii;i; 2. — Giant SAND-rarri.K 



Ocourring in " qnartzose s.nndrock" of the Medina formation, exposed in the Niagara gorge, one 

 mile above its mouth. Xew York Central railroad track in the foreground 



GIANT SAND-RIPPLES 



