GEOLOGIC STRUCTURE 



77 



Contour before re- 

 cent landslide 



Mass which moved in 

 recent landslide 



1000- 



Topography by E. H. Bailey and 

 D. L. Everhart 



250 



500 FEET 

 I 



CONTOUR INTERVAL 10 FEET 

 DATUM IS MEAN SEA LEVEL 



FIGURE 55. Topographic map and section of landslide in the New Almaden mine area, 1946. 



lying hillside. These slides, which were only a few 

 years old when mapped, are much like rock streams 

 or rock glaciers, having crenulated surfaces and very 

 steep arcuate fronts. They move very slowly, appar- 

 ently when saturated with water, by solifluction; in 

 this climate freezing can play no part in their move- 

 ment. 



GEOLOGIC STRUCTURE 



The geologic structure of the California Coast 

 Ranges, amid which the New Almaden district lies, 

 has been intensively studied so far as the post-Fran- 

 ciscan (post-Cenomanian) rocks and structures are 

 concerned, by petroleum geologists and others, with 

 the result that the geologic history of the region from 



