230 SMITH AND M EX 1) EXIT ALL — TERTIARY GRANITE 



breaking across the strata, by the contact metamorphism of the leaf- 

 bearing rocks, and b}' the independence of the structure of the stratified 

 rocks and the intruded mass, which has the character of a batholith. 



Granitic intrusions of a like nature play an important role in the 

 northern Cascades and belong to two distinct epochs of igneous activity, 

 one being pre-Eocene, the other late Tertiary. 



