MATERIALS OF THE EARTH 63 



developed in the same region at the same time. The amount of 

 vertical displacement is the throw of the fault. The amount of throw 

 occasionally reaches several thousand feet. 



Fig. 36. A topographic map showing a steep mountain slope, which is a 

 fault-scarp, southwest of Honey Lake. Scale, about 4 miles to the 

 inch. (Honey Lake, Gal., Sheet, U. S. Geol. Surv.) 



If the slipping takes place between layers, instead of along 

 joint planes, the term shear is commonly applied to the movement, 

 but it is in reality a phase of faulting. Such faulting may take 



