The Repetto Hills are a chain of hills in Los Angeles County, California that separate the San Gabriel Valley to the north from the Los Angeles Basin to the south.[1][2][3] The Repetto Hills include Mount Washington, the Monterey Park Hills, and the Montebello Hills.[1]
To the Repetto Hills' west are the San Rafael Hills across the Arroyo Seco, and the Elysian Hills across the Glendale Narrows section of the Los Angeles River. To their east edge are the the Puente Hills across the Whittier Narrows.[1]
The elevations range from ~870 feet in Montecito Heights to 200 feet at their western end. The hills are separated by dry valleys that had active drainage during the wetter periods of the Pleistocene ice ages over 20,000 years ago. The hills feature outcroppings of the sedimentary tertiary era Fernando Formation, Puente Formation, and Topanga Formation, and are within the transition zone between the Peninsular and Transverse Ranges.[1]
References
- "SR 710 North Study: Geologic Hazard Evaluation to Support Environmental Studies Documentation" (PDF). Los Angeles County Metropolitan Transportation Authority. 2014. p. 2-1. Retrieved 2025-01-19.
- "Azusa TOD Specific Plan Draft EIR: Population, Housing, and Employment". City of Azusa. 2015. Retrieved 2025-01-19.
- Yerkes, R. F.; McCulloh, T. H.; Schoellhamer, J. E.; Vedder, J. G. (1965). "Geology of the Los Angeles Basin California—an Introduction: Geology of the Eastern Los Angeles Basin Southern California" (PDF). U.S. Geological Survey. p. A1. Retrieved 2015-01-19.