DEVONIAN 



SILURIAN MIDDLE AND CAMBRIAN AND PALEOZOIC M6TAM0RPHIC KEWEENAWAN BELT SERIES 



UPPER lOWER PALEOZOIC 



OROOVICIAN ORDOVICIAN 



•■^TE ' UPPER MIDDLE AND HASTINGS AND BAHLIEB' KEEWATIN 



PRECAMBRIAN HURONIAN LOWER MUHONIAN 6 RENVILLE PRECAM BRIAN 



LAURENTIAN LAUftENTlAN' PRE CAM BRIAN GNEISSES AND TERTIARY POST CAM BRl A N PRE C*MBRIAN 



UNDIFFERENTIATED SCHISTS EfFUSlVES IHTRUSIVES INTRUSIVES 



