SCIENTIFIC BACKGROUND 



155 





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CRATER AT LA VIC NEAR CADIZ RIFT 



The molten sub-crust scmetimes reaches the surface along fault line 



from west to east. Together with the great structural 

 trough between them and accompanying phenomena, 

 they are objects of great interest worthy of detailed 

 study. 



THE CADIZ FAULT 



The northwest-southeast ranges of the region men- 

 tioned consist of several parallel ribbons of fault block 

 structures of similar directions, and chiefly dominated 

 by two major lines which I may term the Cadiz and 

 Newberry faults respectively. 



The northernmost of the two faults mentioned is a 

 narrow fault zone which may be named the Cadiz 

 fault. Its path is shown by the notches which cut 

 across the south ends of the desert ranges of the Great 

 Basin (including those known as the "Bristol Peaks," 

 "Old Dad," "Marble" and "Old Woman" ranges), and 

 by the alinement of the south ends of these ranges 



