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Eocene to early Miocene strata were strongly faulted and folded along southwest-verging structures prior to deposition of upper Miocene (Mohnian) strata of the Modelo Formation. Granodiorite is faulted against Eocene along an overturned unconformity. The Canton fault, separating Mendenhall(?) Gneiss on the east from granodiorite on the west, cuts the basal conglomerate member of the Modelo and is overlain unconformably by younger Modelo strata. This fault, probably a preMohnian strand of the San Gabriel fault, continues for more than 7 km southeast of its surface termination to a subsurface intersection with the San Gabriel fault. Another abandoned strand pre-dates deposition of the Pico Formation. Strata of Miocene and Pliocene age thin sharply toward the northeast against a submarine ridge of basement parallel to the San Gabriel fault. Locally, the Hasley conglomerate member of the Miocene-Pliocene Towsley Formation is absent over structural highs. Post-Saugus structures of late Quaternary age comprise a fold belt cut by the Del Valle, Holser, Hasley, Oak Canyon, and Santa Felicia south-dipping reverse faults. These faults do not become vertical with depth, and the faults post-date at least some of the folds. The Santa Felicia fault apparently overrides the youngest strand of the San Gabriel fault. Tectonic landforms are less apparent in the east Ventura basin fold belt than along the Oak Ridge and San Cayetano faults which die out eastward in the Val Verde quadrangle. However, river terraces north of Potrero Canyon may be widespread there because of downwarping along the Santa Clara syncline. The Del Valle and Holser faults locally control drainage that flows parallel to the faults on the downthrown side. No evidence of Holocene movement has been found.

Cenozoic structure of the Val Verde 7 1/2-minute quadrangle and south half of the Whitaker Peak 7 1/2-minute quadrangle, California