APPENDIX A. 



SUMMARY OF NORTH AMERICAN STRATIGRAPHY. TABLES OF 

 GEOLOGICAL FORMATIONS. 



The following table gives the subdivisions of the geologic scale 

 as adopted in this work : 



PsYCHozoic OR Quaternary. 



Holocenic or Recent System. 



Pleistocenic System. 

 Cenozoic or Tertiary. 



Pliocenic System. 



Miocenic System. 



Oligocenic System. 



Eocenic System. 



Mesozoic or Secondary. 

 Cretacic System. 

 Comanchic System. 

 Jurassic System. 

 Triassic System. 



Paleozoic or Transition. 



Permic System. 



Carbonic System. 



Mississippic System. 



Devonic System. 



Siluric System. 



Ordovicic System. 



Cambric System. 

 Eozoic OR Proterozoic, Primary in part. 



Algonkic Systems. 

 Azoic or Archeozoic ; Primary. 



Archseic Systems. 



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