PRELIMINARY OUTLINE. 



19 



Cenozoic 



Mesozoic, 



Paleozoic 



Proterozoic . 



Archeozoic. 



GENERAL TABLE OF GEOLOGIC DIVISIONS. 



Present. 

 Pleistocene. 

 Pliocene. 

 Miocene. 

 Oligocene. 

 Eocene 



Transition (Arapahoe and Denver). 

 Upper Cretaceous. 



Lower Cretaceous (Comanche or Shastan), 

 Jurassic. 

 Triassic. 

 Permian. 



Coal Measures or Pennsylvanian. 

 Subcarboniferous, or Mississippian. 

 Devonian. 

 Silurian. 

 Ordovician. 

 , Cambrian. 

 Great interval. 

 Keweenawan. 

 Interval. 

 Animikean or Penokean. 



(Upper Huronian of some authors). 

 Interval. 



Huronian. 

 Great interval. 



Archean Complex. 



Great Granitoid Series. 

 (Intrusive in the main, 

 Laurentian.) 



Great Schist Series. 

 (Mona, Kitchi, Lower 

 Keewatin, Coutchiching, 

 Lower Huronian of some 

 authors.) 



