GEOLOGICAL FORMATIONS. 61 
tification of the earth’s crust follow each other in regular 
sequence, and that in this sequence they differ from the 
present creation, as they do from each other. 
We must make ourselves acquainted with the order of 
succession of these strata. They are the shelves in 
which the vegetable and animal remains lie stored. To 
arrange them was certainly possible only by taking the 
organisms which they contained as guides or clues. 
We, however, shall take this arrangement as our data, 
and, with the object we have in view, we shall naturally 
consider only those strata and rocks in which fossils— 
using this word in its widest interpretation—are or might 
be contained, those, namely, which are proved to be 
sedimentary, z.¢. aqueous deposits. Our information is 
limited to a great part of Europe, numerous districts of 
America, and scattered points of the rest of the world. 
The following table gives the the arrangement of the 
sedimentary strata from above downwards :— 
x. Alluvium, 
z. Diluvium. 
3. Tertiary formation. 
Pliocene, 
Miocene. 
Eocene, 
4. Cretaceous formation. 
of English 
Sinon, = White Chalk and Chalk Marl Peete = 
Turon. = Part of the Chalk Marl Page's Ad- 
Kinoman. = Upper Greensand vanced’ Text 
Book, 
Gault. 
Neocoman (Wealden). 
5. Jurassic formation or Oolite. 
Upper White Jura (Malm). 
Middle Brown Jura (Dogger). 
Lower Black Jura (Lias). 
