Museum Bulletin No. 25. Plate XXVII 
109 
Asymmetrical or current ripple-mark on Cambrian B. Asymmetrical or current ripple-mark on quartzite, 
sandstone, South March, Ont. (Pages 43, 51, 53.) Tiger peak, Cour D’Alene district. Photograph 
by F. L. Ransome, U.S.G.S. (Pages 48, 51.) 
