. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. eds are to be found no nearer than about 2 miles from thepresent developed territory. The well logs and a study of the adja-cent territory indicate, however, that the formations involved in thegeology of this field include at least a part of those exposed to theeast in the vicinity of the Los Angeles city held. They are (a) 2,000 +feet of Puente sandstone; (b) 2,000d= feet of upper Puente shale andthin-bedded sandstone; (c) 2,000+ feet of Fernando clayey andsandy shale, sandst
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. eds are to be found no nearer than about 2 miles from thepresent developed territory. The well logs and a study of the adja-cent territory indicate, however, that the formations involved in thegeology of this field include at least a part of those exposed to theeast in the vicinity of the Los Angeles city held. They are (a) 2,000 +feet of Puente sandstone; (b) 2,000d= feet of upper Puente shale andthin-bedded sandstone; (c) 2,000+ feet of Fernando clayey andsandy shale, sandstone, and gravel, and (d) an unconformable cappingof Pleistocene gravel, sand, and clay varying in thickness from 40 to190 feet or more, the whole covered by alluvium. A detailed descrip-tion of these formations is given in the discussion of the generalgeology of the district and will not be repeated here. OIL SANDS. The most productive sands occur at the top of the Puente forma-tion although traces and locally more or less important accumulat ionsof oil and gas are found in the shale above the principal oil ?: - ;•
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