Peninsular Ranges

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Peninsular Ranges
Devils-Peak Sierra-SanPedroMartir BajaCalifornia Mexico.jpg
Sierra San Pedro Mártir and Devils Peak, Southern Baja California, Mexico
Highest point
Peak San Jacinto Peak
Elevation 10,834 ft (3,302 m)
Geography
Countries Mexico and United States
States Baja California Sur, Baja California and California
Geology
Age of rock Mesozoic
Type of rock Granite

The Peninsular Ranges (also called the Lower California province [1] ) are a group of mountain ranges that stretch 1,500 km (930 mi) from Southern California to the southern tip of the Baja California peninsula; they are part of the North American Coast Ranges, which run along the Pacific Coast from Alaska to Mexico. Elevations range from 150 to 3,300 m (500 to 10,834 ft).

Contents

Geography

Topographic depiction of the Peninsular Mountains within the US consisting of the Santa Ana, Palomar and Laguna Mountains from north to south SoCal Coast.jpg
Topographic depiction of the Peninsular Mountains within the US consisting of the Santa Ana, Palomar and Laguna Mountains from north to south

The Peninsular Ranges include the Santa Ana Mountains, Temescal and other mountains and ranges of the Perris Block, San Jacinto and Laguna ranges of southern California continuing from north to south with the Sierra de Juárez, Sierra de San Pedro Mártir, Sierra de San Borja, Sierra de San Francisco, Sierra de la Giganta, and Sierra de la Laguna in Baja California. Palomar Mountain, home to Palomar Observatory, is in the Peninsular Ranges in San Diego County, as are Viejas Mountain and the San Ysidro Mountains. The Peninsular ranges run predominantly north-south, unlike the Transverse Ranges to their north, which mostly run east-west.

Geology

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.[ citation needed ]

Between this set of ranges and the Transverse Ranges is the complex Malibu Coast—Santa Monica—Hollywood fault, which exists as the border between these two mostly geologically unitary provinces. [2]

Ecology and flora

Nearctic

View from Inspiration Point in the Laguna Mountains, 2013. Chaparral in the foreground, Anza Borrego Desert State Park on the right of the background. Inspiration Point Laguna Mountains.JPG
View from Inspiration Point in the Laguna Mountains, 2013. Chaparral in the foreground, Anza Borrego Desert State Park on the right of the background.

Most of the Peninsular Ranges are in the Nearctic realm. Several terrestrial ecoregions cover portions of the Peninsular Ranges. On western-coast side of the northern portion of the ranges the California montane chaparral and woodlands sub-ecoregion of the California chaparral and woodlands ecoregion covers in southern California and northern Baja California. On western-coast side of the southern portion of the ranges the Baja California Desert ecoregion covers in the southern portion of the Peninsular Ranges in Baja California and Baja California Sur. On eastern side of northern ranges, the Sonoran Desert ecoregion covers southeastern California and northeastern Baja California as far south as the town of Loreto, Baja California Sur. On the eastern side of the Laguna Mountains in San Diego County the Anza-Borrego Desert State Park is known for its springtime profusion of Colorado Desert (Sonoran) wildflowers. On eastern-Gulf of California side of the southern portion of the ranges the Gulf of California xeric scrub ecoregion covers the range in Baja California Sur.

The higher portions of the Peninsular Ranges, especially the west-facing slopes, are home to coniferous and mixed evergreen forests. Cleveland National Forest covers much of the higher Southern California Peninsular Ranges. The vegetation includes oak woodlands and forests of Jeffrey Pine (Pinus jeffreyi) and Coulter Pine (Pinus coulteri). The Sierra Juarez and San Pedro Martir pine-oak forests cover upper slopes of Sierra Juarez and San Pedro Martir ranges in Baja California. These isolated forests, predominantly Tamarack Pine (Pinus contorta subsp. murrayana), Sugar Pine (Pinus lambertiana), Parry Pinyon (Pinus quadrifolia), White Fir (Abies concolor), California Incense Cedar (Calocedrus decurrens), and junipers. Oak species include Coast Live Oak (Quercus agrifolia), Engelmann Oak (Quercus engelmannii), Canyon Live Oak (Quercus chrysolepis), and Baja Oak (Quercus peninsularis). These higher portions of the Peninsular Ranges harbor many rare and endemic species.

The Sierra de la Giganta in Baja California Sur Sierra La Giganta.jpg
The Sierra de la Giganta in Baja California Sur

Neotropic

Southern Baja California Sur is part of the Neotropical realm. The southern end of the Baja California Peninsula, including the Sierra de la Laguna Peninsular Range, was, like the rest of the peninsula, originally part of the Mexican mainland. It was sheared off the mainland, becoming at one time an island, and evolved in relative isolation from the northern part of the peninsula and ranges. Its flora and fauna share many affinities with southern Mexico and Central America. It includes three distinct ecoregions, the Sierra de la Laguna dry forests, Sierra de la Laguna pine-oak forests, and San Lucan xeric scrub.

See also

Related Research Articles

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<span class="mw-page-title-main">Sierra de San Pedro Mártir</span> Mountain range in northwestern Mexico

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<span class="mw-page-title-main">California chaparral and woodlands</span> Ecoregion in the western United States and Mexico

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<span class="mw-page-title-main">Madrean pine–oak woodlands</span>

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<span class="mw-page-title-main">Sierra de Juárez</span> Mountain range in Baja California, Mexico

The Sierra de Juárez, also known as the Sierra Juarez, is a mountain range located in Tecate Municipality and northern Ensenada Municipality, within the northern Baja California state of northwestern Mexico.

<span class="mw-page-title-main">Sierra Juárez and San Pedro Mártir pine–oak forests</span> Temperate coniferous forests ecoregion in Baja California, Mexico

The Sierra Juárez and San Pedro Mártir pine–oak forests is a Nearctic temperate coniferous forests ecoregion that covers the higher elevations of the Sierra Juárez and Sierra San Pedro Mártir ranges of the Peninsular Ranges, of the northern Baja California Peninsula of Mexico. The pine–oak forests extend throughout the central portion of the Mexican state of Baja California and terminate near the border with the U.S. state of California.

<span class="mw-page-title-main">Sierra de la Laguna</span> Mountain range at the southern end of the Baja California Peninsula in Mexico

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<span class="mw-page-title-main">Sierra de la Laguna pine–oak forests</span> Ecoregion in Mexico

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<span class="mw-page-title-main">Sierra de la Laguna dry forests</span> Ecoregion in Mexico

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<span class="mw-page-title-main">San Lucan xeric scrub</span> Xeric shrubland eoregion of Baja California Sur, Mexico

The San Lucan xeric scrub is a xeric shrubland ecoregion of the southernmost Baja California Peninsula, in Los Cabos Municipality and eastern La Paz Municipality of southern Baja California Sur state, Mexico.

<span class="mw-page-title-main">Constitution 1857 National Park</span> National park in Baja California, Mexico

Constitution 1857 National Park is located in the pine forests of the Sierra de Juárez mountain range in the northern part of Baja California, Mexico. The park is an important preserve for many native wild animals like bighorn sheep and mule deer. The park is characterized by the large variety of coniferous plant species.

<span class="mw-page-title-main">California coastal sage and chaparral</span> Mediterranean forests, woodlands, and scrub ecoregion in Mexico and the United States

The California coastal sage and chaparral is a Mediterranean forests, woodlands, and scrub ecoregion located in southwestern California and northwestern Baja California (Mexico). It is part of the larger California chaparral and woodlands ecoregion.

<span class="mw-page-title-main">California montane chaparral and woodlands</span> Mediterranean forests, woodlands, and scrub ecoregion in California, United States

The California montane chaparral and woodlands is an ecoregion defined by the World Wildlife Fund, spanning 7,900 square miles (20,000 km2) of mountains in the Transverse Ranges, Peninsular Ranges, and Coast Ranges of southern and central California. The ecoregion is part of the larger California chaparral and woodlands ecoregion, and belongs to the Mediterranean forests, woodlands, and scrub biome.

Southern California Coastal–Baja California is a freshwater ecoregion in Western North America. It covers portions of central and southern California and west of the Coast Ranges as well as most of Mexico's Baja California Peninsula, extending from the southern end of Monterey Bay to the southern tip of the Baja California Peninsula.

References

  1. Benke, Arthur C.; Cushing, Colbert E. (2005). Rivers of North America. Academic Press. pp.  543. ISBN   0-12-088253-1.
  2. Meigs, Andrew J.; Oskin, Michael E. (2002). "Convergence, block rotation, and structural interference across the Peninsular-Transverse Ranges boundary, eastern Santa Monica Mountains, California". In Barth, Andrew (ed.). Contributions to Crustal Evolution of the Southwestern United States. Geological Society of America. pp. 281–87. ISBN   978-0-8137-2365-5.

Coordinates: 29°57′N114°43′W / 29.95°N 114.72°W / 29.95; -114.72