COMPOUND FAULTS 



24; 



not a true plane, but of curved and irregular course. In the 

 latter case, there will be a succession of cavities along the fault, 

 which frequently are filled up by a subsequent deposit of minerals, 

 and thus converted into mineral veins. 









- 







1 





Fig. 103. — Strata bent upward near the fault plane. The hole is artificial. 

 (U. S. G. S.) 



Faults may die out in a few yards, or they may run for hundreds 

 of miles ; they may be simple or compound, single or branching. 

 A compound fault is made up of a number of parallel dislocations, 

 placed close together, which may all hade in the same direction, 

 or in opposite ways, but in the latter case one hade prevails over 

 the other. A series of parallel faults, wider apart than in the com- 



