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Ornithichnites, bird trades in stone. Owen's curious figure, 



medal-ruled, in his GeoL 

 ^.2.. Wise, Iowa and Minn., 

 1852, pi. 1, fig. 2, cannot 

 by any possibility be a 

 hird track, for it was 

 found on a slab of red 

 sandstone, on the N. W. 

 shore of Lake Superior, 

 where the rocks are of a 

 presilurian age, and we 

 have no trace of the ex- 

 istence of birds until 

 long after the Coal Age. 

 Owen, after studying 

 many and various forms of it, all found in the sam^ rocks, 

 concluded that they were all unknown seaweeds. 

 Orodus elegantulus. N. and W., Pal. Ohio, Vol.[2, 1875, 

 12 ., r2a. p. 51, pi. 58, fig. 12, 12 a. 



