PHYSIOGRAPHIC EVIDENCE OJ RECENT FAULTING 



665 



tical forces, especially since the uplift changes from side to side. If the 

 fault was formed in none of the ways mentioned above, it must have 



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Figure 1. — Principal Faults on the San Francisco Peninsula 

 After A. C. Lawson, with additions by Steplien Taber 



originated through shearing in a horizontal direction ; and, once formed, 

 local stresses due to uplift of adjacent areas would be relieved by vertical 

 adjustments along it. 



XLIV — Bull. Geol. Soc. Am., Vol. 34. 1922 



