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Oblique aerial photograph looking northeast

Oblique aerial photograph looking northeast toward the southeastern San Gabriel Mountains, with the communities of Claremont, Pomona, and Ontario in the foreground. The large Canyon left of center is San Antonio Canyon, with Mt. San Antonio (Mt. Baldy) the high summit at the left edge of the photo. East of San Antonio Canyon lie Cucamonga Canyon and Day Canyon. The abrupt south front of the San Gabriel Mountains here is marked by the Cucamonga Fault zone. Although the late Quaternary history of this zone is well known, longer-term fault movements presumably responsible for uplift of the southeastern San Gabriel Mountains are not well understood. Photo by D.M. Morton, USGS, January, 1976.

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