. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. ?: - ;•. LOS ANGELES DISTRICT : SALT LAKE FIELD. 187 The oil is supposed to be derived largely from the diatoms and otherminute organic remains found in the underlying shale and finds itsfiray into the sandy layers mainly through the multitude of joint•racks which penetrate both the shale and sandstone. BREA DEPOSITS. The brea deposits in the Salt Lake field are the most important inthe Los Angeles district. They cover a considerable territory in (See PI. XXIV, B.) A n
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. ?: - ;•. LOS ANGELES DISTRICT : SALT LAKE FIELD. 187 The oil is supposed to be derived largely from the diatoms and otherminute organic remains found in the underlying shale and finds itsfiray into the sandy layers mainly through the multitude of joint•racks which penetrate both the shale and sandstone. BREA DEPOSITS. The brea deposits in the Salt Lake field are the most important inthe Los Angeles district. They cover a considerable territory in (See PI. XXIV, B.) A number of years ago large quantities ofphis brea were removed and used for paving purposes, the resultantiepression filling up with water and forming a lagoon. The brea islargely the result of the impregnation of porous sand and soil by oilcozing up from below. That the process is still going on is evidencedby the heavy oil which may be seen oozing from the banks of thelagoon and of several other brea pits in the vicinity. Large quanti-ties of gas are also escaping in the same region, as is shown by theIntermittent strea
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