75 
Museum Bulletin No. 25. 
Plate X. 
A. Plaster east of asymmetrical ripple-mark with tracks of invertebrates, 
Windsor, N.S. (Page 12.) 
B. Plaster cast of asymmetrical ripple-mark and invertebrate trails on sand 
mixed with a percentage of mud, Avon river, Windsor, N.S. (Page 12.) 
