[cmorrs of flje Utuscum of Compuratibc .^oulocft) 



AT HARVARD COLLEGE. 



Vol. XI. Part I. 



LITHOLOGICAL STUDIES. 



A DESCRIPTION AND CLASSIFICATION OF THE 

 ROCKS OF THE CORDILLERAS. 



By M. E. WADSWORTH. 



WITH EIGHT PLATES. 



CAMBRIDGE- 



prtntcti for t^e iHuscum. 

 October, 1884. 



