. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. silytraced along its surface outcrop than any other stratum in theregion. Angular fragments of thin shale strew the surface of theground throughout the greater part of the distance from Lake Shoreavenue westward to a point 1^ miles southeast of Colegrove. If itwere not for this hard, flinty shale the difficulty of tracing the con-tinuity of the formations north of the central field would be greatlyincreased. Above this flinty shale band lie the soft conglomerate, heavy andthin
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. silytraced along its surface outcrop than any other stratum in theregion. Angular fragments of thin shale strew the surface of theground throughout the greater part of the distance from Lake Shoreavenue westward to a point 1^ miles southeast of Colegrove. If itwere not for this hard, flinty shale the difficulty of tracing the con-tinuity of the formations north of the central field would be greatlyincreased. Above this flinty shale band lie the soft conglomerate, heavy andthin-bedded iine-grained sandstone, and sandy and clayey shale ofthe Fernando. This formation is probably over 2,000 feet thick, onlythe lower part, however, being exposed in the central field. In thisfield the soft, thin-bedded sandstone is confined largely to the lower500 feet of the formation. This sandstone appears to be more or lesspetroliferous toward the west end of the field, and as a consequenceits outcrop is stained rusty red, purple, and pink. This coloration of U. S. GEOLOGICAL SURVE1 BULLETIN NO. 309 NODULAR MIOCENE SANDSTONE AT LOS ANGELES
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