Plate 49 



To face p. rl58 



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E. O. Eckel, photo. 



Hiackett's quarry, Dunwoodie N. Y. 

 (Yonkers gneiss) 



E. O. Eckel, photo. 



Flannery's quarry, Dunwoodie N. Y. 

 (Yonkers gneiss) 



