186 GEOLOGICAL SUCCESSION OF ANIMALS. 



2d. The Upper Silurian. It is also a veiy extensive 

 formation, since about ten stages of it are found in the 

 State of New York.* 



3d. The Devonian, including in North America no less 

 than eleven stages. t It occurs also in Russia and Scotland, 

 where it was first made out as a peculiar formation. 



4th. The Carboniferous Formation, consisting of three 

 grand divisions. | 



5th. The Trias, or Saliferous Formation which, contain- 

 ing the richest deposits of Salt on the continent of Europe, 

 comprises three stages,^ to one of which the Sandstone of 

 the Connecticut valley belongs. 



6th. The Oolitic Formation, only faint traces of which 

 exist on the continent of America. It comprises at least four 

 distinct stages. || 



7th. The Cretaceous or Chalk Formation, of which three 

 principal stages have been recognized, two of which are 

 feebly represented in this country, in the Southern and Mid- 

 dle States. 



8th. The Loiver Tertiary or Eocene, very abundant in the 

 Southern States of the Union, and to which belong the 

 coarse limestone of Paris, and the London clay in England. 



* 1. Oneida Conglomerate ; 2. Medina Sandstone ; 3. Clinton Group ; 

 4. Niagara Group ; 5. Onondaga Salt Group ; 6. Water Limestone ; 

 7. Pentamerus Limestone ; 8. Delthyris Shaly Limestone ; 9. Encrinal 

 Limestone ; 10. Upper Pentamerus Limestone. 



t 1. Oriskany Sandstone; 2. Cauda-Galli Grit; 3. Onondaga Lime- 

 stone; 4. Corniferous Limestone; 5. Marcellus Shale; 6. Hamilton 

 Group; 7. Tully Limestone; 8. Genesee Slate; 9. Portage Group; 

 10. Chemung Group ; 11. Old Red Sandstone. 



I I. The Permian, extensively developed in Russia, especially in the 

 government of Perm; 2. The coal measures, containing the rich deposits 

 of coal in the Old and New World ; 3. The Magnesian Limestone of 

 England. 



1. New Red Sandstone ; 2. Muschelkalk ; 3. Keuper. 



II 1. The Lias; 2. The Lower Oolite ; 3. The Middle Oolite ; 4. The 

 Upper Oolite. 



