Doc. No. 9.] 17 



be said to be the southern terminus of the Yalley Santa Clara, though 

 south of the "Loma Muertas " it is called San Juan; at this point it nar 

 rows to a canon and continues thus forty miles to the south-east ; after 

 passing the Tres Finos it becomes rough and irregular, though attaining 

 ho great altitude for most of this distance, and from the appearance of the 

 Canada beyond, obtained from an elevation of eight hundred feet, it is 

 probably connected with the Tulare plain some forty miles south, and 

 from its appearance the elevation must be very moderate, as no hills 

 were visible along the axis of the canon to obstruct the view to a horizon 

 beyond. 



The stream that courses this Canada is termed San Benito as far south 

 as the Arroya los Muertas, and eight miles south of the Rancho Tres 

 Pinos, after which it takes the name of San Juan ; it discharges its 

 waters into the Pajaro fourteen miles north of the Eancho Santa Anna; 

 the latter river forming the boundary of the counties Santa Clara, Santa 

 Cruz and Monterey. 



The pass Santa Anna is situated in the Monte Diablo Range and enters 

 these mountains from the west, two leagues south of the Tres Pinos, and 

 from the Canada San Benito ; it was extremely rocky so far as examined 

 though attaining no great altitude, the mean of its course was fifteen 

 degrees north of east. This canon appears to have formeol the banks of 

 an ancient stream, and it is not improbable that the San Joaquin might 

 have flowed through this section, and discharged its waters into the bay 

 of Monterey ; I did not pass through the entire length of the canon and 

 am therefore unable to form an opinion on this point that would be sat 

 isfactory in this particular. The features observed on which this suppo 

 sition is founded, are that a series of outliers, or rather narrow terraces 

 are traceable for nine or ten miles up the Canada, such as occur on streams 

 whose beds have been drained from successive elevations from subter 

 ranean forces. These peculiar features are not uncommon in the more 

 elevated portions of the Sierra Nevada or Coast Mountains, and in the 

 middle and northern parts of the former they may be traced for long- 

 distances. 



The Monte Diablo Range is connected with the line of mountains 

 which separate the Tulare and Salinas Valleys ; and constitute in fact but 

 one range, having their terminus within the thirty-fourth parallel, when 

 they are intercepted by the San Bernardino mountains, which it appears 

 from the U. S. R. R. Survey, pursue a course nearly at right angles to 

 the trend of the former ; while the low mountains forming the east 

 border of the Salinas from the Mission San Miguel on the south to the 

 Pajaro River on the north, can be considered nothing but a spur of the 

 Monte Diablo Range. 



The principle partis of this spur of granitic and other primitive rocks, 

 on which the tertiaries rest; the granite is first developed in and about 

 the Cinega del Grabilan, this mountain being made up for the most part 

 of these rocks ; at the next highest peak twelve miles south of the above 

 known as, the Chupedero, the granite .passes into a coarse sienite much 

 disintegrated and loose on the surface ; the sienite continues to the Canada 

 Solza a distance of six miles, beyond which it was not examined for 

 twenty miles. It is doubtful if the granite rocks extend to any consider 

 able distance beyond this localitv, as the general aspect of the country 

 3 



