STRUCTURAL DETAILS OF THE CONTACT 



149 



of the sandstone and granite and the adaptation of the lines of deposit 

 in the sandstone to the outline of the granite. Near the middle of the 

 west side of this outlier is a little fault (figure 13), and near the north end 

 another original irregularity (figure 12). With these exceptions the con- 

 tact, Avhich is not exposed on the east side of this outlier, is a nearly 

 perfect plane along the entire west side, several hundred feet in length. 



+ ++ +xV^ • ; -V + i + + ++ + + 



+ + + + + + +7\+ + +-+ +^ t + 



+ i+ +.+ h\ + + + 

 ++ + 



nch = ^ .5" fe et 



I i nch = A-{ e et. 



Figure \4.— Contact broken by a Fault with re- Figure 15. — Contact broken by a Gravity Fault, 

 versed Flexure. 



The fourth and largest outlier, immediatel}' behind the camera in 

 plate 16, shows on the south side, from east to west, first a reversed fault, 

 with a flexing of the sandstone and contact contrary to the apparent 

 movement (figure 14). The sandstone is slickensided along the fault. 

 Fifty feet west of this are two compensating slickensided faults of the 



:+ +: 



''m^UWn}m0m^^mmp - 



I inch = 20|eet. 



Figure 16. — Contact broken by compensating Thrust Faults. 



same general type (figure 16), and only requiring greater throw to make 

 of the included sandstone a good sandstone dike. The original irreg- 

 ularity of the contact between these oblique slips is clearly due, as in 

 many other cases, to an apparent concretionary structure in the granite, 



XXIII— Bull. Geol. Soc. Am., Vol. 10, 1898 



