460 F. H. Lahee — Metamorphism and Geological Structure. 



of these suggestions of folding and squeezing, the lithological 

 structure and the texture of the pegmatite display little, if any, 

 evidence of crushing. 



Fig. 7. Fig. 8. 



Fig. 7. Tortuous dike of pegmatite cutting the schistosity, yet with a 

 tendency to trend parallel to this structure. 



Fig. 8. Thick pegmatite dike, which, although irregular, shows a ten- 

 dency to trend parallel to the schistosity of the country rock. 



Fig. 9. Fig. 10. 



Fig. 9. Pegmatite dike with a loop-like lateral extension which encloses 

 a large xenolith of the country rock. 



Fig. 10. Pegmatite dike, showing relations between the schistosity and 

 the edges of the dike. 



Fig. 11. Fig. 12. 



Fig. 11. Crumpling of schistosity against dike of pegmatite. 

 Fig. 12. Irregular dike of pegmatite, bedding (parallel to the upper lines 

 in the diagram), and cleavage (parallel to the lower lines in the diagram). 



Absolute parallelism of the intrusive and the foliation of the 

 country rock are very rare. When the cleavage is intersected 

 at an acute angle, it may be nearly coincident with the sinuosi- 

 ties of the contact (fig. 10). When it distinctly abuts against 

 the dike, it may be minutely crumped or may fan out (figs. 10 

 and 11). 



