672 



ROY R. MORSE 



The thrust character of the strong joint plane dipping to the right 

 in Figure 3 is shown in the offset of the joint and dike indicated by 

 the pick. The displacement along the thrust plane is here 20 



lu,. -2. — Joints in granodiorite. Looking north. Rhomboidal joint blocks 

 produced by the intersection of the two sets of inclined joints, crossed by the fainter 

 steep dike joints. The strong joints dipping to the right are frequently small thrust 

 fault planes, as in the one at the bottom of the view. 



Fig. 3. — Thrust character of man}- of the east-dipping joint planes, indicated by 

 the displacement of the dike near the pick. 



