TRUCTURE AND CLASSIFICATION 
—s 
OF 
PU ay TES. 
BY 
Ens De DANA, 1M, 
GEOLOGIST OF THE UNITED STATES EXPLORING EXPEDITION. 
DURING THE YEARS 
1838, 1859, 1840, 1841, 1842. 
PHILADELPHIA: 
LEA AND BLANCHARD. 
1846. 
