520 



GEOLOGY. 



ally when traced horizontally, sometimes by passing into monoclinal 

 folds, and sometimes without connection with folding. In depth they 

 probably die out in similar ways in most cases. Where the throw is 



Fig. 431. — Contorted and faulted laminated rock. Cook Inlet. (Gilbert, U. S. 



Geol. Surv.) 



Fig. 432.— Faulting shown in a cobblestone. The fault-planes have become veins 

 by deposition from solution. The figure shows how the relative ages of crossing- 

 faults may be determined. (Schrader, U. S. Geol. Surv.) 



