Ill 
Museum Bulletin No. 25. 
Plate XXVIII. 
A. Asymmetrical ripple-mark, Blacksmith canyon, Logan, Utah. (Page 48.) 
B. Asymmetrical or current ripple-mark with transverse wave ripple-mark 
on Cambrian sandstone, Castle mountain, B.C. Photograph by 
L. D. Burling. (Pages 30, 43, 53.) 
