The American Geologist, Vol. XXVIII. 
Plate VI. 
Fig. 13. Five parallel ridges in MtcJiua sandstone. Gwynne's quarry, Murray, N. Y. 
Looking N. The ridges show poorly in the view on the floor of the quarry. 
Fig. 14-. Basin in Medina sandstone. Lookinj 
Near the ridges shown in Fig. 13. 
Fig. 15. Basin between sand ridges, beach of Lake Ontario. 
"Beach Structures in Medina Sandstone." — H. L. Fairchild. 
