The American Gkologist, Vol. XXVIII. 
Fig. 10. Crested sand ridge on the beach of Lake Ontario. Looliing \V. 
Fig. 11. — The same sand rid^e as shown in Fig. lo, but the view taken a day later. 
The stakes mark the crestline of the previous day. The crest is now at 
the end of the clinometer, and not distinct in the engravings. 
Fig. 12. The same sand ridge as shown in Figs. 10 and 1 1 , liut looking 
eastward at the west end. 
"Be.\ch Structures in Medin.\ Sandstone.'' — 11. L. Fairchild. 
