EFFECTS OF CROSS FAULTING. 



161 



as great in one system as in the other, the isolated blocks of equal displacement will 

 be separated from one another, as are the starting and stopping squares of the 

 knight move on a chess board. If the displacement of one system is three times, 

 instead of twice, as great as the other, the blocks of equal displacement will 

 be removed (in the diagram) one square farther from one another, in a direction 

 parallel to the faults of greater displacement, and so on. If, again, the faults in 

 each system are unequal amotuj themselves in regard to their amount of displacement, 

 the fault blocks bounded by the two systems will be distributed in many apparently 

 irregular ways, and each block will appear as a separate unit that has moved 

 independently, rather than as the resultant of intersecting faults. Still, in all cases, 

 it appears to hold good that in general the zones of blocks of equal displacement, 

 roughly aligned though these ma\' be, will lie diagonally between the two fault 

 systems. Which diagonal it will be can be ascertained from the following diagram, 

 fig. 55: 



Fra. 55. Diagram showing trend of zones of equal displacement with given directions of downthrow. 



As illustrated in fig. 53, these conclusions hold good for faults striking obliquely 

 to one another as well as at right angles. They also hold good for faults which dip 

 obliquely instead of perpendicularly, and for cases where the dips in the two sets are 

 different in angle or direction, or both. 



Application of principles to Wandering Boy cross faults. These deduced 

 general principles enable us to understand the result of the intersecting faults in 

 the Wandering Boy 300-foot level. The resultant of the east-west and the north- 

 south faulting is a northeast trend of equal displacement, as indicated on the figure, 

 16843 No. 4205 1 1 



