234 Whitney’s Geology of California. 
mence distinct, but which finally become merged into the main 
mass. The chain is traversed by several depressions, separating 
the higher groups of pens and in these depressions are the 
more important passes. The following table shows the sub- 
divisions, and the heights of the higher peaks of each group, 
nd of the intervening passes. a 
Name and height. 
Groups. Highest or nt. of next Pass south. 
Monte Diablo, Mt. Diablo, 3856, Livermore Pass, 686. 
Mount Hamilton, Mt. Hamilton, 4440,  Pacheco’s “ 1470. 
anoche, Mariposa peak, 3700, Panoche “ 2500. 
San Carlos, San ris os, 4977, strella fe 2 
Estrella, Pass El Roble, ? > 
Monte Diablo, the culmination of the most northern group, is 
about 80 miles from San Francisco, and forms a most interesting 
and pepspiengns feature, and by far the best known landmark, 
he state. Althou 
along its crest, and the whole area spread out before the eye is 
nearly 40,000 square miles. 
e mountain consists essentially of a double arch of Cre- 
taceous ghee highly metamorphosed near the crest ; this meta- 
morphic center ombra races about six or seven square miles, en- 
portion i, ae ssa ho iti in character, ind may prove > erupti 
Bula con pe on the metam: Wages 
Js Pe, quality of bit al, 1 
of the mines in 1864. oe 37 oe and 8 larg 
