Draft:Repetto Hills

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The Repetto Hills are a chain of hills in Los Angeles County, California.

The Repetto Hills are a group of small hills and valleys roughly oriented east–west, separating the San Gabriel Valley to the north from the Los Angeles Basin to the south.[1][2][3] At its western edge, it is separated from the San Rafael Hills by the Arroyo Seco, and from the Elysian Hills by the Glendale Narrows section of the Los Angeles River. At its eastern edge, the Whittier Narrows separates it from the Puente Hills. The area is considered to be within the transition zone between the Peninsular Ranges and Transverse Ranges.[1]

The Repetto Hills include Mount Washington, the Monterey Park Hills, and the Montebello Hills. The elevations range from ~870 feet in Montecito Heights to 200 feet at their western end. The hills feature outcroppings of sedimentary Tertiary-age Fernando Formation, Puente Formation, and Topanga Formation. 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.[1]

References

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  1. ^ a b c "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.
  2. ^ "Azusa TOD Specific Plan Draft EIR: Population, Housing, and Employment". City of Azusa. 2015. Retrieved 2025-01-19.
  3. ^ 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.