GEOLOGY. 345 



2. In San Luis Obispo Valley. The asphaltum covers thirty 

 acres. 



3. The Napoma ranch, in San Luis Obispo County. The 

 springs are small, and yield but little. 



4. On the ranch of La Purissima, in Santa Barbara County. 



5. A place six miles west of the town of Santa Barbara. 

 The deposit of asphaltum covers three hundred acres, from 

 two to eight feet thick. 



6. Rincon, of San Buenaventura, Santa Barbara County. 



7. A place near the San Buenaventura River, twelve miles 

 from its mouth, in Santa Barbara County. 



8. A place near the Santa Clara River, eighteen miles from 

 its mouth, in Santa Barbara County. 



9. A place in the Sierra Santa Susanna, in Los Angeles 

 County. 



10. In Los Angeles Valley, Los Angeles County. 



11. The San Pedro Hills, in Los Angeles County. . 



12. San Juan Capistrano, Los Angeles County. 



One of the deposits in Santa Barbara is so near the sea, 

 that the mineral might be thrown with a shovel into a 

 chute which would carry it into the hold of a vessel at anchor. 



The asphaltum generally comes up through sandstone. The 

 springs of Santa Barbara seem to have ceased to flow, while 

 those in Los Angeles County are still active. It is supposed 

 that the amount lying on the surface at the various deposits 

 is not less than five thousand tons. 



275. Miscellaneous Minerals. Sulphur occurs at the suL 

 phur bank near Clear Lake, at the Geysers, near San Buena- 

 ventura, in San Diego County, thirty miles northward from 

 the bay, and in Colusa County. At the sulphur bank the 

 mineral is mixed with earth, sand, and soda. Sulphur springs 

 abound in the Coast Range; and in the volcanic districts 

 about Clear Lake, the Geysers, Mt. Shasta, and Mt. Lassen, 

 there are numerous vents for sulphurous fumes, which deposit 

 their sulphur on the sides of the holes through which they rise 

 to the surface. 



