236 Whitney’s Geology of California. 
Fossils are not abundant, but are sufficiently so for a satisfactory 
determination of the age. Kvidences of the enormous thickness 
of this formation, and also of that of certain members of the 
Tertiary, were found in other parts of the State. 
ong the most of this group, the Cretaceous rocks extend to 
- the base on the eastern side; but on the west, there are Tertiary, : 
altered in places. The San José valley lies west of this group 
The metamorphic center of this mass is not broken on the 
south, but extends along the chain to an unknown distance on 
the southeast, certainly beyond San Carlos, and probably much 
farther, or over 150 miles. No eruptive rock is known in this 
group. 
In the next group south, the Panoche group, there are a num- 
ber of peaks of eruptive rock, which are its culminating points. 
Pachecos peak is the most conspicuous, although not the highest, 
being but 2845 ft., the highest points being about a thousand 
feet higher. Antimony occurs in this part of the chain, but has 
not been turned to economical use. West of this group lies the 
San Juan valley. : 
Near the line of the next depression south, the Panoche Pass, : 
there are remarkable evidences of the lateness of the disturb- 
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mines being the New Idria, and the San Carlos. An immensely 
altitude as we approach its southern end; that it apparently re 
ceives another range of hills that crosses the Salinas valley below — 
the San Antonio river; that the hills along its eastern margin 
grow more dry and barren south of the Pachecos Pass; and that 
in the Estrella Pass and Pass el Roble, Tertiary fossils have beet 
