ROCKS AT NEW ALMADEN. 311 



of the district must therefore iiichiJe beds containing this fossil and dating 

 from the Neocomian. I did not succeed in finding Auedla. 



The metamorphic rocks are for the most part identical with those so 

 prevalent in tlie Coast Ranges. Pseudodiabase, pseudodiorite, phtlianites, 

 serpentine, and less altered rocks are abundant. There are also masses of 

 limestone, one of which is quarried for the manufacture of quicklime. 

 The occurrence of this rock, which is rather rare in the Coast Ranges, 

 affords the observer an opportunity of estimating the intensity of the dis- 

 turbance which attended the metamorphism. The mass of limestone from 

 which the material for the limekiln is obtained must have formed a portion 

 of a continuous stratum, but this has been so broken and dislocated that 

 it now appears only as irregular patches scattered through the hills and 

 it is quite impossible to restore the original configuration or to obtain from 

 it any aid in elucidating the stratigraphy of the accompanying rocks. It 

 was found possible to lay down the serpentinoid areas in this district, and 

 they have received a separate color on the map. As on the other maps 

 where this has been done, it must be understood tliat no sharp division 

 really exists and that the purpose of the delineation is simply to indicate 

 as nearly as may be the distribution of a certain phase of metamorphism. 

 The general structure of the ridges of metamorphic rock seems to be syn- 

 clinal, as it is at so many points in the Coast Ranges. 



Granite. — Tlicre IS uo reason to doubt that granite underlies the region 

 of New Almaden, though at a considerable depth. In the (lavilan Range 

 and at ^lonterey, to the south, granite is exposed, and it appears also to 

 the north, near Point San Pedro. The composition of the sandstones also 

 indicates that the material of which they are composed is of granitic origin. 

 As is shown in other portions of this report, there is evidence that the en- 

 tire area of the Coast Ranges is underlain by granite, and the facts observed 

 lead almost inevitably to the conclusion that the brush-covered hills, if 

 examined with sufficient care, would show many outcrops of the rock 

 which have hitherto escaped observation. It is far from improbable that 

 granite is exposed in the somewhat inaccessible country southeast of New 

 Almaden. 



