GNEISSES IN THE HIGHLANDS OF NEW JERSEY 



607 



cases, however, the appearance of the contorted strata was such as 

 to imply that the flexures were of a minor order, not involving 

 large masses of rock but suggesting considerable freedom of move- 

 ment among the component layers. The contortions appear to 

 have originated during the period of injection and not during 

 subsequent movements of solidified rock. Frequently individual 

 bands are sharply bent, while others lying at either side, but 

 separated by intervening granite, are nearly straight. An instance 



Fig. 12 



of this may be seen in Fig. 3 . On the whole the general parallelism 

 of the basic bands lying in the midst of masses of granite and the 

 agreement of their strike with the general strike of the region was a 

 noticeable feature and was considered important in its implication 

 regarding the mechanism of the process by which the granite was 

 injected. It implies that the granitic magma entered among the 

 layers of a previously schistose or foliated rock without causing 

 great disturbance in their position. Some of the layers appear 

 to have become incorpoi:ated in the magma, others were forced 



