CHAPTER IV. 

 STRUCTURAL RESULTS OF FAULTING. 



Views of previous observers. — Before proceecUng; to a description of the occur- 

 rence of the rocks forming the subject of the preceding chapter, it seems 

 necessary to discuss tlie faulting action traceable on and near the Lode, for it 

 has had an important share in determining the present position and relations of 

 the rocks. As has been seen in Chapter IL, Baron von Richthofen regarded 

 the Lode as a true fissure, only following the contact between the syenite 

 (diorite) of Mount Davidson and the east country rock for a portion of its 

 length because of the low resistance offered by this contact. He also insisted 

 that fanlting both preceded and followed the deposition of ore. He does not 

 state, I believe, whether he regarded the west wall of the lode as a continuation 

 of the exposed surftxce of Mount Davidson, but implies that it is not, for he 

 speaks of the course of the vein as "somewhat" dependent upon the shape 

 of the slope. Mr. King, at the time of writing his memoir, considered the 

 vein as lying upon a continuation of the slope of the exposed west country, 

 an opinion to which he was led by the striking resemblance between the 

 contours of the west wall and those of Mount Davidson. Subsequently, 

 from an examination of the character of the west wall, he came to the con- 

 clusion' that the contact between east and west country was itself a faulted 

 surface. Mr. Church recognized abundant .evidence of faulting action, but 

 regarded the contact of the east and west country as continuous with the 

 exposed surface. 



' Privately commuuicatcd to luc. 



