. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. n of Brea Ridge, extending eastward farbeyond the region of the Santa Fe wells. Westward it may betraced to its disappearance beneath the valley opposite the Puenteoil field. Still lower in the series and occupying the inner or north-ern slope of Brea Ridge arc several bands of petroliferous sand-stone that display a few concretions and here and there a pebblemass and are interbedded with arenaceous clay. Two of the sand-stone bands are particularly conspicuous, one well down
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. n of Brea Ridge, extending eastward farbeyond the region of the Santa Fe wells. Westward it may betraced to its disappearance beneath the valley opposite the Puenteoil field. Still lower in the series and occupying the inner or north-ern slope of Brea Ridge arc several bands of petroliferous sand-stone that display a few concretions and here and there a pebblemass and are interbedded with arenaceous clay. Two of the sand-stone bands are particularly conspicuous, one well down on thenorth face of the ridge, the other north of the ridge near the creekchannel. It is possible that these may lie at the same horizon, butthat they are duplicated by faulting, the valley of the creek beingcoincident with a line of marked local disturbance. These bedscarry fossils of lower Pliocene age. (See list, p. 107.) In the hillnorth of Brea Canyon there is a further succession of beds of clay,sandstone, and conglomerate, one or two of the conglomerate beds U. S. GEOLOGICAL SURVEY BULLETIN NO. 309 PL. XIV. A. LA BREA CANYON FIELD, ORANGE southeast.
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