UNSTRATIFIED CONDITION. 



121 



by the author from granitic rocks near "Valparaiso). The veins undergo con- 

 stant changes of size, and in some places encircle masses of rock resembling 



Fig. 121. Fig. 122. 



the rock outside. The rock adjoining the vein is more micaceous than that at 

 a distance, and the direction of the lamination (as indicated in the figures) varies 

 with some reference to the intersecting veins, curving approximately parallel 

 to the veins on two opposite sides m and n, and not at all so on the other two 

 o andjs. The subdivisions of the veins in fig. 121 cross one another in an alter- 

 nate manner, a cutting d and e but cut by c, and b cut by e, d, and e ; and in 

 122, although the veins are similar in constitution, one cuts the other; and in 

 120 the two crossing veins are broken and subdivided at the intersection so as 

 to appear like one vein stretching off in two directions like a letter X. 



Fig. 123. 



Fig. 123. A vein a faulted by b, — whence it is inferred that b is subse- 

 quent to a in age. Also a vein 1 faulted by 2 and again by 3, and 3 faulted 



Fig. 124. Fig. 125. Fig. 126. 



Fig. 127. 



h= H=? 



by 4 : 2 and 3, therefore, were subsequent in age to 1, and 4 was subsequent to 3. 

 The faulting is exhibited also in the layers of the stratified rocks which the 

 veins intersect. 



