PRINCIPLES 
OF 
GEOLOGY, 
BEING 
AN ATTEMPT TO EXPLAIN THE FORMER CHANGES 
OF THE EARTH'S SURFACE, 
BY REFERENCE TO CAUSES NOW IN OPERATION. 
UY 
CHARLES LYELL, Esq., F.R.S., 
FOR. SEC. TO THE GEOL. SOC, PROF. OF GEOL. TO KING'S COLL., LONDON 
IN THREE VOLUMES. 
Vol. III. 
LONDON: 
JOHN MURRAY, ALBEMARLE-STREET. 
MDCCCXXXIII. 
i 
