G. Schuchert — Pre-Cambrian Nomenclature. 



477 



Lawson Classification 1916 







a 



9 



W 



n£ 





a co 





"5 ^ 











N 

 O 



£>o 



93 



<TS 



a 



CD 



fc 



Ph 







Keweenawan 

 (Epoch, Series) 



Aniinikian 

 (Epoch. Series) 



Eparchean Interval. Major Unconformity 



Algo man Revolution 



I*, 

 co 



'c'S 

 o a) 



S3 ^ 



M 



Temiskamian 

 (Epoch, Series) 



Unconformity 



Bruce 

 (Epoch, Series) 



Epilaurentian Interval. Major Unconformity 



Laurentian Revolution 



§02 



O <d 

 CM 



Grenville 

 (Epoch, Series) 



Keewatin 

 (Epoch, Series) 



Coutchiching 

 (Epoch, Series) 



Schuchert Classification 1915* 



Waucobian (Cambrian) 

 Paleozoic 



9 s 

 W — 



CD 



'3 S 



CD '-*3 



la 



Great Epi-Proterozoic Interval 



^s 



Keweenawan 

 (Period) 



Animikian 

 (Period) 



Huronian 

 (Period) 



Ep-Algomian Interval 



03 

 O 'cD 



■ss 





Algomian Revolution 



a o 



S3T3 



a ., 

 J o 

 6 "c? 



CD k-J 



as 



Sudburian 

 (Period) 



Ep- Archeozoic Interval 



W 42 

 ° s 

 e _ 

 n a 



g a 



"Ph 



Laurentian Revolution 



JD ■£ 

 g^ 



cd a 

 "a S 

 Ph~ 



Keewatin "| 



(Period) 



Coutchiching i 

 (Period) J 



{- Grenville 



■Essentially the same as Schuchert and Barrell 1914. 



