tcmou'S of iht Uluscum of Comparatibe ^oolo^u 



AT HARVARD COLLEGE. 

 Vol. XI. Pakt I. 



LITHOLOGICAL STUDIES. 



A DESCRIPTION AND CLASSIFICATION OF THE 

 ROCKS OF THE CORDILLERAS. 



By M. E. WADSWORTH. 



WITH EIGHT PLATES. 



CAMBRIDGE: 



iPrt'ntcb for tfjc iHuseum. 

 October, 1884. 



