>@ ACTIVE AND DOR 

 MANT VOLCANOES 



LATE CENOZOIC 

 VOLCANIC ROCKS 



MID -CENOZOIC 

 VOLCANIC ROCKS 



INTRUSIVE ROCKS 

 MID-TERTIARY IN SONORA 

 LATE CRET (?) IN S M. DEL SUR 

 EARLY TERTIARY IN COASTAL PLAIN 



FOLD AND THRUST 

 BELT (LARAMIDE) 



PRE-BATHOLITHIC 

 VOLCANIC ROCKS 

 (CHIEFLY EARLY CRET.) 



NEVADAN BATHOL1THIC 

 AND METAMORPHIC BELT 



PALEOZOIC METAMORPHIC 

 ROCKS AND ASSOCIATED 

 INTRUSIVES 



NORMAL FAULTS 



<<<<<<<< 



(<<<<< t 







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i S* 5 i S 



MILES 



Fig. 35.1. Major tectonic and igneous units of Mexico. See Fig. 43.3 for active and dormant volcanoes. 



