144 



GEOLOGY OF TONOPAH MINING DISTRICT, NEVADA. 



Abundant and strong striations on the fault planes of the northeast system, 

 together with the evidence afforded by minute faulting and stringers and b3' 

 the dragging of faulted veins, indicate that while the main movement was com- 

 plicated by numerous smaller ones, the general result was that the blocks on the 

 west side of the separate northeast faults were shoved northward past the blocks 

 on the east side, nearly horizontally, but with a slight downward plunge (tig. 38). 



Fid. 3x. Stereogram showing nature of movement along the main northeast faults in Fraction No. 1 workings. 



THE NORTHWENT FAl'l.TS. 



There is also a well-marked system of faults striking north of west, sometimes 

 parallel to the veins, but generally cutting across them at slight angles. These 

 faults may have some connection with the northwest fault, which is shown on the 

 map as running just east of the Fraction workings (the Wandering Boy fault). 

 Thev have a great variety of dips, sometimes vertical and sometimes nearly 

 horizontal, with intermediate angles. An illustration of their effects is seen in 



