. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. Fig. 1.—Index map of a portion of southern California, showing the location of the three districtsdescribed in this bulletin and of the other important producing districts of the State. The San Gabriel Range, in which rise the southerly heads of Santa(Lira River, equals in ruggedness and general altitude the moun-tains to {lie north. This range, with its western extension, theSanta Susana Mountains, separates the Santa Clara Valley fromthose of Los Angeles, Tujunga, and San Ga
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. Fig. 1.—Index map of a portion of southern California, showing the location of the three districtsdescribed in this bulletin and of the other important producing districts of the State. The San Gabriel Range, in which rise the southerly heads of Santa(Lira River, equals in ruggedness and general altitude the moun-tains to {lie north. This range, with its western extension, theSanta Susana Mountains, separates the Santa Clara Valley fromthose of Los Angeles, Tujunga, and San Gabriel rivers, while stillfarther west Oak Ridge and South Mountain, in extension of the U. S. GEOLOGICAL SURVEY aJSttBfc^£«>« ^?>-.,. &y^Bt* ??l?l_mi» ^^•*\!?Sf^; .1. PANORAMA ACROSS HOPPEIFrom Hopper. B. THE GREAT TOPATOFFrom hill above Los ^ BULLETIN NO. 309 PL. II SI TO VALLEY OF PIRU RIVER,ura County. -* [ Jk • *k*m Line, sespe oil field. ills, Ventura County. SANTA CLARA VALLEY: TOPOGRAPHY. 3 Susana Mountains, lie between this valley and the minordon of the Simi. The San Gabriel Range attains its maxi-iltitude at 10,080 feet in San Antonio Peak, in the eastern ()! f the uplift. The highest peak in the Santa Susana Moun- eaches 3,756 feet. Oak Ridge and South Mountain rise to urn elevations of 3,000 and 2,258 feet, respectively. Santa Clara receives its principal streams frorft the north. from east to west, these are: Castac, Piru, Sespe, and Santa •reeks. The courses of these streams are most tortuous, their ring been determined in part by structure, in part by erosion. canyons are deep, sharply cut, and in many places cliff bound Laccessible. In addition, there is a well-distributed and dense i of chaparral. Sespe and Santa Paula creeks carry compara- large amounts of wate
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