'h-^^ 



■k 



'i 



-. f 



'11 



. U 



^1 



V ] 



1 





in 



tf*p 



1 • 1 



•, 



1 



1, 



f^ 



E 



If 



1 



n 



t 



Sect. VI .] 



GEOLOGY. 





observation, liis very vision, "become deeper and clearer. 



however, must expect to solve the manj 



^ di 



s 



wliich will be encountered, and which foi 





I Ion 



No 01 



cultie 



time will remain to perplex geologists ; but a ray of 



light will occasionaHy be his reward, and the reward is 



ample. 



diagram 



-! • 1 



w^ 



e 



pposed 



simple superposition 





the beds gives 



. r^.r^^ their relative antiquity : but the be 



section w 



hich 



a 



sea-voyager can hope to make 



will 



seldom include but a small portion of the lor^ ■^'^quence 

 of known geological formations. And as the voyager 



seldom passes over large districts, he will rarely succeed 

 in plachig in proper order, by the aid of superposition 

 alone, the formations which he successively meets with 

 even in the same country. Hence he m.ust, more than any 

 other geologist, rely on the characters of the 

 organic remains, and must sedulously collect every 



men and fragment of a specimen. By the means of fossil 



..mains, not only will he be enabled to arrange (with 

 the help of naturalists on his return home) the formations 

 in the same country according to their age, but their 

 contemporaneity with the deposits of the most distant 

 parts of the world can thus and by no other method be 

 ascertained ; for it is now known that at each geologica 

 epoch the marine animals partook in the most distant 

 quarters of a general similarity, even when none of the 



species were identically the same : thus beds have been 



recogni 



and in India 



which must have been deposited when the chalk in Eu- 

 rope was accumulating beneath the sea. 



fc-r 



L / 



Lf 



\ , 



^ 

 ^ 



r 



