temotrs of t^c Museum of Comparalibe ^oologg 



AT HARVARD COLLEGE. 

 Vol. XI. Part I. 



LITHOLOGICAL STUMES. 



; ' 1 ' • I I r. r. •' 



►Nbl 



A DESCRIPTION AND CLASSIFICATION OF, THE 

 ROCKS OF THE CORDILLERAS. ^ X. 



By M. E. WADSWORTH. 



WITH "^IGHT PLATES. 



'CAMBRIDGE: 



Prfntcti for ti^e ffluscum. 

 October, 1884. 



