73 
Museum Bulletin No. 25. 
Plate IX. 
A. Asymmetrical or current ripple-mark modified by waves running oblique 
to the direction of the current; the finer sculpturing is the work of 
wave action; Avon river below Windsor, N.S. (Pages 29, 30.) 
B. Plaster cast of asymmetrical ripple-mark of large amplitude with gravel 
and coarse sand in troughs, beach at Kingsport, N.S. (Page 21.) 
