SANDSTONE DIKES OF UTE PASS. 147 



deposits into earthquake and fault fissures and chasms. 

 The only examples so far recognized are those of Ute Pass 

 and the Pike's Peak massif; but according to the explana- 

 tion which I have proposed this is probably not a rare type, 

 especially in the Rocky Mountain region. 



(c) In situ, by compressive and shearing movements. 

 The examples described by Dana belong here, and practi- 

 cally all sharply defined crushed zones accompanying faults 

 and joints. This type is the commonest of all ; but, as 

 noted, the material is not intrusive, and hence they are 

 dike-like in their structural but not in their genetic rela- 

 tions. 



