418 R. C. WALLACE 
profusion of vegetable growth would presumably be possible only 
in the shallower waters nearer shore. In the pre-Devonian rocks, 
Fic. 7.—Section showing dolomitized area (center of field). 31 
definite impressions of fucoids are rare, though “fucoidal traces”’ 
have been the dernier ressort in cases of difficulty." Unless when 
t Seward, Fossil Plants, I, 139. 
