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Looking south from from a Santa Clara County Water District facility in the Oak Hills toward a new development in progress in the Silver Creek area. In the distance is the Santa Clara Valley between San Jose and Morgan Hill. The Oak Hills are underlain by serpentinite and form part of a structural medial ridge that extends northward underneath southern San Francisco Bay. In the South Bay region, the Silver Creek basin is to the east of this ridge, the Cupertino Basin is to the right of this ridge. Both basins are relatively young, and contains massive quantities of Quaternary-age sediments.
