appendix a: geological column. 



Development of Geological Column — Continued. 



685 



Dana. 1875-1879. 



Age of Man, or Quaternary. 

 Post-Tertiary ... 



Tertian- 



Pleistocene or Post-Tertiary 



Pliocene. 



Miocene. 



Eocene. 



Opper Cretaceous. 

 Middle Cretaceous. 

 Lower Cretaceous. 



Wealden 



Wealden. 



( tolitic epoch. 



Liassie epoch. 



(Upper Oolite . Purbeck. Portland, and Kirnmeridge clays 

 MiddleOolite /Coral rag. 

 - lmale Uolltc -\Oxfordclay. 



1 nwer Oolite (Stonesfield. 

 |Lo«, r Oolite -inferior 0olite . 



(Upper Lias. 

 ] Middle Lias. 

 [Lower Lias. 



Keuper. 



Muschelkalk. 



Buntersandstone. 



Permian 



Carboniferous . 



Subcarboniferous 



v - 



Catskill... 



Chemung 



Hamilton . . 

 Corniferous. 



Oriskany 



Lower Helderberg. 

 Salina 



Niagara 



Canadian. 



Primordial or Cambrian 



Archean. 



15 

 14c 

 146 

 14a 



136 

 13a 



12 



II'. 

 11a 

 in,- 

 106 

 10a 

 9c 

 96 

 9a 



Permian. 



Upper Coal Measures. 

 Lower Coal Measures. 

 Millstone grit. 



Upper. 

 Lower. 



Chemung. 



Portage. 



Genesee. 



Hamilton. 



Marcellus. 



Corniferous. 



Schoharie. 



Cauda-galli. 



Oriskany. 



Lower Helderberg. 



Salina. 



Niagara. 



Clinton. 



5a , Medina. 



Cincinnati. 



Utica. 



Trenton. 



Chazy. 



Quebec. 



Calciferous. 



Potsdam. 

 Acadian. 



Archean. 



