LOCAL EFFECTS OF SAN FRANCISCO EARTHQUAKE 305 



in a northeasterly direction. The Miocene sandstones that form 

 the greater part of the Santa Cruz Range come down to the fault- 

 line on the west, but on the east side erosion has removed the over- 

 lying beds and exposed the Franciscan series, so that it is only at 

 some distance away from the fault toward the east that the Miocene 

 sandstones and gravels reappear. 



Fig. 2. 



At about fifteen minutes after five o'clock on the morning of April 

 18, 1906, the Stevens Creek fault was suddenly refractured, and a new 

 displacement occurred abng the old fault-line, producing the earth- 

 quake that shook the adjacent region. 



This new displacement is chiefly lateral, the southwest side cf 

 the fault having moved toward the northwest, or vice versa; and 

 ins:me places this has been accompanied by a small uplift en the 

 northeast, or a small downthrow on the southwest, or both. The 



