262 



University of California Publications. 



[Geology 



Various severe internal movements have affected the strati- 

 fied rocks. At Timber Gap compressive forces acting along the 

 strike have caused severe buckling of the limestone beds. On 

 Crystal Creek the same forces acting as an oblique shear have 

 shoved the beds over one another, and have produced an appear- 

 ance resembling an erosional unconformity (Plate 29A). The 

 angular discordance amounts to 14°. The apex of the acute 

 angle is occupied by brecciated masses of quartzite, and crushed 

 horses of quartzite are common in the limestones. On the oppo- 

 site side of the ridge shown in the photograph the strata have 

 been intensely shattered and contorted. Owing to the near 

 proximity of the contact it is impossible to discriminate the 

 thermal rending from the crumpling due to a sort of buttress 

 action. 



The granites of the region show no macroscopic evidences of 

 deformation. The microscopic investigation, however, showed 

 frequent straining of the quartz, and occasional faulting of 

 apatite needles. These minor cataclastic phenomena constitute 

 the last page in the diastrophic record of the Mineral King area. 



University of California, 

 May, 1905. 



