. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. northern walls oflower Sisar Canyon. The extent of the development is about a milein length by 400 or 500 feet in width, the direction assumed by thewells being approximately S. 71° 45 E., or about the trend of the linebetween the properties of the Bard Oil and Asphalt Company on thesouth and certain others on the north. The collars of the wells arebut a short distance below the brow of the mesa that extends back tothe main mass of the mountains on the north, being about 1,500
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. northern walls oflower Sisar Canyon. The extent of the development is about a milein length by 400 or 500 feet in width, the direction assumed by thewells being approximately S. 71° 45 E., or about the trend of the linebetween the properties of the Bard Oil and Asphalt Company on thesouth and certain others on the north. The collars of the wells arebut a short distance below the brow of the mesa that extends back tothe main mass of the mountains on the north, being about 1,500 feetabove sea level, or 500 feet above the bed of Santa Paula Canyon. Only two or three formations outcrop in the Silver Thread oldest of these, which occupies the northern portion of the belt,represents the upper part of the Topatopa and consists of a series ofrusty conglomerate, sandstone, and shale, with interbedded quartz- U. S. GEOLOGICAL SURVE\ 3ULLETIN NO. 309 PL. VI .1. FLANKS OF OAK RIDGE AND SANTA SUSANNA MOUNTAINS, SHOWING POST-PLIOCENE PENEPLAIN. From mouth of Sulphur Canyon; looking B. THE UPPER OJAI crest of Sulphur Mountain, Ventura County SANTA CLARA VALLEY: SILVER THREAD FIELD. 47 ose limestones, which carry fossils that have been determined to beEocene. These rusty beds are a part of the overturned south flankof the great anticline to the north, and pass directly beneath thegreat body of older Topatopa quartzite and shale that occupies thevery heart of the range. The red beds, probably belonging to the Sespe formation, are exposedin a narrow belt little more than 100 yards wide, along the upper por-tion of the face of the ridge north of Sisar Canyon. They outcropsouth of the rusty beds, passing beneath them, however, with a north-erly dip, as part of the overturned series. They consist of coarsesandstone, streaked red and white, and shale colored in like manner,as in the Sespe region. In the Silver Thread field, as well as in the
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