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Fontana, San Bernardino County, California, United States of America (34.09223 -117.43505)
Most of the city of Fontana, like its eastern neighbors Rialto and San Bernardino, is built atop a geologically young, gently southward-sloping alluvial fan from nearby Lytle Creek, deposited mainly during the Holocene and late-Pleistocene epochs. There are also sedimentary deposits of similar age from Etiwanda Creek on the western edge of the city. However, the northern and southern edges of the city are formed by the much older San Gabriel and Jurupa mountain ranges, respectively. The Jurupa Mountains are composed primarily of Cretaceous and Paleozoic-era rocks, as are the San Gabriels, which also include even older, Proterozoic formations. The most prominent of the San Gabriel Mountains visible from Fontana is Cucamonga Peak, elevation 8,859 feet (2,700 m). Additionally, the Cucamonga Fault Zone, contiguous with the Sierra Madre Fault Zone, runs through the northern part of the city, along the base of the San Gabriels, notably through the Hunter's Ridge and Coyote Canyon planned communities. It is estimated to be capable of producing earthquakes approximately of magnitude 6.0-7.0.