888 



THE WONDERS OF GEOLOGY. 



Lect.VIII. 



For there is not an atom in the crust of the globe that 

 may not have passed through the complex and marvellous 

 laboratory of life ! 



Thus we find that all the varied orders of animals, from 

 the Infusoria up to Man, have contributed, more or less, by 

 their organic remains, to swell the amount of the solid 

 crust of the earth. The following table presents a concise 

 view of some of the most obvious examples of this indispu- 

 table fact : — 



Rocks composed wholly or partly of Animal Remains. 



Prevailing Organic Remains. 

 . Trilobites 



Strata. 



Formations. 

 ( Silurian 

 ' |system. 



(Corals, crinoidea, crustaceans,^ 



| shells, &c j "~ 



Brachiopodous shells .... 



( Carboni- 

 Corals and shells ) ferous 



(.system. 



Crinoidea and shells — 



Fresh-water mussels — 



Trilobites, insects, and shells . . — 

 Pentacrinites, reptiles, fishes . . Lias 

 Terebratulse, and other shells . . — 



Fishes, shells, corals — 



Shells, principally gryphites . . — 



Terebratulse, and other shells . J 1 ^ 6 " * 



\ Oolite 



Shells, reptiles, fishes, iTisects . . Oolite 



Crustacea, reptiles, fishes, insects . — 



(Shells, corals, crinoidea, reptiles,! 



I fishes f 



Ammonite limestone /Shells of cephalopoda, principally) _ 



V ammonites j 



Coral-rag Corals, shells, echini, ammonites 



Bradford limestone . ./Crinoidea, shells, corals, cephaO 



( lopoda j 



(Ammonites, trigonia?, and other | 



\ shells j 



Trilobite schist . . 



Dudley limestone . 



Shelly limestone 



Mountain limestone 



Encrinital marble 

 Mussel-band . . 

 Ironstone nodules 

 Lias-shales and clay 

 Limestone . . 

 Lias conglomerates 

 Gryphite limestone 



Shelly limestone . 



Stonesfield slate . 

 Pappenheim schist 



Bath-stone . . . 



Portland oolite 



