GEOLOGICAL FORMATIONS. 6l 



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, i.e. 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 : — 



1. Alluvium. 



2. Diluvium. 



3. Tertiary formation. 



Pliocene. 

 Miocene. 

 Eocene. 



4. Cretaceous formation. 



r of English 



Sinon. = White Chalk and Chalk Marl | g^g ^^T^j of 



Turon. = Part of the Chalk Marl < pagg'sAd- 



Kinoman. = Upper Greensand vanced Text 



Gault. 



Neocoman (Wealden). 

 Jurassic formation or Oolite. 

 Upper White Jura (Malm). 

 Middle Brown Jura (Dogger), 

 Lower Black Jura (Lias). 



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