Peninsular Ranges

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The Peninsular Ranges (also called the Lower California province) are a group of mountain ranges that stretch 930 mi (1,500 km) from Southern California to the southern tip of the Baja California peninsula; they are part of the North American Pacific Coast Ranges, which run along the Pacific coast from Alaska to Mexico. Elevations range from 500 to 10,834 ft (150 to 3,300 m). The Peninsular Ranges include the Santa Ana Mountains, the Temescal Mountains, other mountains and ranges of the Perris Block, the San Jacinto Mountains, the Laguna Mountains of southern California continuing from north to south with the Sierra de Juárez, the Sierra de San Pedro Mártir, the Sierra de San Borja, the Sierra de San Francisco, the Sierra de la Giganta, and the Sierra de la Laguna in Baja California. Palomar Mountain, home to Palomar Observatory, is in the Peninsular Ranges in San Diego County, as are the San Ysidro Mountains and Viejas Mountain. The Peninsular Ranges run predominantly north-south, unlike the Transverse Ranges to their north, which mostly run east-west. Rocks in the ranges are dominated by Mesozoic granitic rocks, derived from the same massive batholith which forms the core of the Sierra Nevada Mountains in California. They are part of a geologic province known as the Salinian Block which broke off the North American plate as the San Andreas Fault and Gulf of California came into being. Between the Peninsular Ranges and the Transverse Ranges lies the complex Malibu Coast—Santa Monica—Hollywood fault, which exists as the border between these two mostly geologically unitary provinces. Most of the Peninsular Ranges are in the Nearctic realm. Several terrestrial ecoregions cover portions of the Peninsular Ranges.