1 
,/4^-H 414 
ON T H E 
GEOLOGY AND NATURAL HISTORY 
OF THE 
UPPER MISSOURI. 
BEING THE SUBSTANCE OF A 
REPORT MADE TO LIEUT. G. K. WARREN, T.E.U.S.A. 
BY DR. F. V. LLYYDEN, 
»t • 
SURGEON AND GEOLOGIST OP THE EXPEDITION TO THE UPPER MISSOURI AND 
YELLOWSTONE, UNDER THE COMMAND OF LIEUT. WARREN. 
PHILADELPHIA: 
PRINTED BY C. SHERMAN & SON. 
1862 . 
