Faults. 21 
horizontal dislocation b c, is called the heave of the 
fault. 
Law of Normal Faults: To find the continuation 
of the vein, in this case, we assume that the right hand 
side of the figure has moved downward along the fault 
plane AB, the motion thus conforming to the law of 
gravitation; if, therefore, the vein was lost at D, we 
would naturally expect to find its continuation some- 
where on the fault plane in-the direction C. If lost at 
C, the direction of the movement being downward, the 
continuation of the vein should be sought in the direc- 
tion D, or in general. Rule.—If at the point where the 
vein is lost the Fault-plane les under foot; to find the 
continuation of the vein, drive upwards on the Fault- 
plane. If the Fault-plane lies overhead at the pownt 
where the vein is lost, drive downward along the Fault- 
plane A B. 
Fig. 10 exhibits a Reversed or Overlap Fault. 
The portion C has slipped from D upwards along the 
fault plane A B. The direction of this movement being 
the reverse of that of normal faults; and hence the 
rule given for finding the continuation of the vein gov- 
FIG 10. 
Reverse Fault. 
