^B COAST UPHEAVALS. 453 



else on the slope of the hill, prove beside 

 that these upheavals have not been continuous 

 and uniform, but intermittent. ... In an- 

 other letter I will tell you something of my 

 observations upon the geographical distribu- 

 tion of marine animals at different depths and 

 on different bottoms, and also upon the rela- 

 tions between this distribution and that of 

 the fossils in the tertiary deposits. . . . 



