Geography of California

Last updated
Map of California topography and geomorphic provinces California Topography and Geomorphic.gif
Map of California topography and geomorphic provinces
California's major mountain ranges California Mountain Ranges.gif
California's major mountain ranges

California is a U.S. state on the western coast of North America. Covering an area of 163,696 sq mi (423,970 km2), California is among the most geographically diverse states. The Sierra Nevada, the fertile farmlands of the Central Valley, and the arid Mojave Desert of the south are some of the major geographic features of this U.S. state. It is home to some of the world's most exceptional trees: the tallest (coast redwood), most massive (Giant Sequoia), and oldest (bristlecone pine). It is also home to both the highest (Mount Whitney) and lowest (Death Valley) points in the 48 contiguous states. The state is generally divided into Northern and Southern California, although the boundary between the two is not well defined. San Francisco is decidedly a Northern California city and Los Angeles likewise a Southern California one, but areas in between do not often share their confidence in geographic identity. The US Geological Survey defines the geographic center of the state at a point near North Fork, California.[ tone ]

Contents

Earth scientists typically divide the state into eleven distinct geomorphic provinces with clearly defined boundaries. They are, from north to south, the Klamath Mountains, the Cascade Range, the Modoc Plateau, the Basin and Range, the Coast Ranges, the Central Valley, the Sierra Nevada, the Transverse Ranges, the Mojave Desert, the Peninsular Ranges, and the Colorado Desert.

State boundaries

The boundaries of California were defined by Spanish claims of Mexico, as part of the province of Alta California. The northern boundary of Spanish claims was set at 42 degrees latitude by the Adams–Onis Treaty of 1819. [1] The states of Nevada and Utah, also originally part of Alta California, also use that line for their northern boundaries. The southern boundary, between California and Mexico, was established by the Treaty of Guadalupe Hidalgo that ended the Mexican–American War in 1848. The line is about 30 miles north of the former Alta California southern boundary. The eastern boundary consists of two straight lines: a north–south line from the northern border to the middle of Lake Tahoe, and a second line angling southeast to the Colorado River. From that point, 14 mi (23 km) south-southwest of Davis Dam on Lake Mohave, the southeast boundary follows the Colorado River to the international border west of Yuma. The eastern and south-eastern boundaries were decided upon during the debates of the California Constitutional Convention in 1849.

Northern California

Mount Shasta from Interstate 5 Mtshasta-large.jpg
Mount Shasta from Interstate 5

Northern California usually refers to the state's northernmost 48 counties.

The main population centers of Northern California include San Francisco Bay Area (which includes the cities of San Francisco, Oakland, and the largest city of the region, San Jose), and Sacramento (the state capital) as well as its metropolitan area. It also contains redwood forests, along with the Sierra Nevada including Yosemite Valley and Lake Tahoe, Mount Shasta (the second-highest peak in the Cascade Range after Mount Rainier in Washington), and the northern half of the Central Valley, one of the world's most productive agricultural regions. The climate can be generally characterized by its marine to warm Mediterranean climates along the coast, to somewhat Continental Mediterranean Climate in the valley to alpine climate zones in the high mountains. Apart from the San Francisco Bay Area and Sacramento metropolitan areas (and some other cities in the Central Valley), it is a region of relatively low population density. Northern California's economy is noted for being the de facto world leader in industries such as high technology (both software and semiconductor), as well as being known for clean power, biomedical, government, and finance.

Alpine tarn in the Trinity Alps Canyon Creek Lakes (3618410685).jpg
Alpine tarn in the Trinity Alps

Klamath Mountains

The Klamath Mountains are a range in northwest California and southwest Oregon, the highest peak being Mount Eddy in Trinity County, California, at 9,037 feet (2,754 m). [2] The range has a varied geology, with substantial areas of serpentine and marble. The climate is characterized by moderately cold winters with heavy snowfall and warm, very dry summers with limited rainfall. [3] As a consequence of the geology, the mountains have a unique flora, including several endemic or near-endemic species, such as Lawson's Cypress (Chamaecyparis lawsoniana) and Foxtail Pine (Pinus balfouriana). Brewer's Spruce (Picea breweriana) and Kalmiopsis (Kalmiopsis leachiana) are relict species, remaining since the last ice age. [4]

Cascade Range

The Cascade Range is a mountainous region stretching from the Fraser River in British Columbia, Canada down to south of Lassen Peak, California. [5] The Cascades (as they are called for short) are part of the Pacific Ring of Fire, the ring of volcanoes around the Pacific Ocean. [6] All of the known historic eruptions in the contiguous United States have been from either Cascade volcanoes or near Mono Lake. [7] :7 Lassen Peak was the last Cascade volcano to erupt in California, from 1914 to 1921. Lassen is the most southerly active volcano of the Cascade chain. [8]

This region is located in the northeastern section of the state bordering Oregon and Nevada, mostly north of the Central Valley and the Sierra Nevada mountain range. The area is centered on Mount Shasta, near the Trinity Alps. Mount Shasta is a dormant volcano, but there is some evidence that it erupted in the 18th Century. [7] :99

Modoc Plateau

In the northeast corner of the state lies the Modoc Plateau, an expanse of lava flows that formed a million years ago and now lie at an altitude of 4,000 to 5,000 feet (1,200 to 1,500 m). [9] The plateau has many cinder cones, juniper flats, pine forests, and seasonal lakes. [10] The plateau lies between the Cascade Range to the west and the Warner Mountains to the east. [9] The Lost River watershed drains the north part of the plateau, while southern watersheds either collect in basin reservoirs or flow into Big Sage Reservoir and thence to the Pit River.

Nine percent of the plateau is protected as reserves or wilderness areas, [9] such as the Modoc National Wildlife Refuge. [11] The plateau supports large herds of mule deer (Odocoileus hemionus), Rocky Mountain Elk (Cervus canadensis), and pronghorn (Antilocapra americana). [9] Herds of wild horses and livestock grazing have altered the original high desert ecosystem of the plateau. [9]

Mono Lake Mono Lake from Mount Dana (1).jpg
Mono Lake

Basin and Range

To the east of the Sierra is the Basin and Range geological province, which extends into Nevada. The Basin and Range is a series of mountains and valleys (specifically horsts and grabens), caused by the extension of the Earth's crust. [12] One notable feature of the Basin and Range is Mono Lake, which is the oldest lake in North America. [13] The Basin and Range also contains the Owens Valley, the deepest valley in North America (more than 10,000 feet (3 km) deep, as measured from the top of Mount Whitney). [14]

In the eastern part of the state, below the Sierra Nevada, there is a series of dry lake beds that were filled with water during the last ice age (fed by ice melt from alpine glaciers but never directly affected by glaciation; see pluvial). [15] Many of these lakes have extensive evaporite deposits that contain a variety of different salts. In fact, the salt sediments of many of these lake beds have been mined for many years for various salts, most notably borax (this is most famously true for Owens Lake and Death Valley).

In this province reside the White Mountains, which are home to the oldest living organism in the world, the bristlecone pine [16]

Coast Ranges

Skyline Boulevard, along the crest of the Santa Cruz Mountains San Francisco Bay Area Skyline Blvd.jpg
Skyline Boulevard, along the crest of the Santa Cruz Mountains

To the west of the Central Valley lies the Coast Ranges, including the Diablo Range, just east of San Francisco, and the Santa Cruz Mountains, to the south of San Francisco. The Coast Ranges north of San Francisco become increasingly foggy and rainy. These mountains are noted for their coast redwoods, the tallest trees on earth, which live within the range of the coastal fog.

Central Valley

California's geography is largely defined by its central feature—the Central Valley, a huge, fertile valley between the coastal mountain ranges and the Sierra Nevada. The northern part of the Central Valley is called the Sacramento Valley, after its main river, and the southern part is called the San Joaquin Valley /ˌsænwɑːˈkn/ , after its main river. The whole Central Valley is watered by mountain-fed rivers (notably the San Joaquin, Kings, and Sacramento) that drain to the San Francisco Bay system. The rivers are sufficiently large and deep that several inland cities, notably Stockton, and Sacramento are seaports.

The southern tip of the valley has interior drainage and thus is not technically part of the valley at all. Tulare Lake, once 570 square miles (1,476 square kilometers) and now dry and covered with agricultural fields, once filled much of the area.

Little Lakes Valley in the eastern Sierra Nevada Little Lakes Valley.jpg
Little Lakes Valley in the eastern Sierra Nevada

Sierra Nevada

In the east of the state lies the Sierra Nevada, which runs north-south for 400 miles (640 km). The highest peak in the contiguous United States, Mount Whitney at 14,505 feet (4.42 km), lies within the Sierra Nevada. The topography of the Sierra is shaped by uplift and glacial action.

The Sierra has 200–250 sunny days each year, warm summers, fierce winters, and varied terrain, a rare combination of rugged variety and pleasant weather. The famous Yosemite Valley lies in the Central Sierra. The large, deep freshwater Lake Tahoe lies to the North of Yosemite. The Sierra is also home to the Giant Sequoia, the most massive trees on Earth.

The most famous hiking and horse-packing trail in the Sierra is the John Muir Trail, which goes from the top of Mt. Whitney to Yosemite valley. This is part of the Pacific Crest Trail that goes from Mexico to Canada. The three major national parks in this province are Yosemite National Park, Kings Canyon National Park, and Sequoia National Park.

Southern California

Southern California Southern California counties in red noshade.png
Southern California

The term Southern California usually refers to the ten southernmost counties which closely match the lower one-third of California's span of latitude. This definition coincides neatly with the county lines at 35° 47′ 28″ north latitude, which form the northern borders of San Luis Obispo, Kern, and San Bernardino counties. Another definition for Southern California uses the Tehachapi Mountains as geographic landmarks for the northern boundary.

Southern California consists of a heavily developed urban environment, home to some of the largest urban areas in the state, along with vast areas that have been left undeveloped. With over 22 million people, roughly 60% of California's population resides in Southern California. It is the second-largest urbanized region in the United States, second only to the Washington/Philadelphia/New York/Boston Northeastern Megalopolis. Where these cities are dense, with major downtown populations and significant rail and transit systems, much of Southern California is famous for its large, spread-out, suburban communities and use of automobiles and highways. The dominant areas are Los Angeles, Orange County, San Diego, and Riverside-San Bernardino, each of which is the center of its respective metropolitan area, composed of numerous smaller cities and communities. The urban area is also host to an international metropolitan region in the form of San Diego–Tijuana, created by the urban area spilling over into Baja California.

Southern California is noted for industries including the film industry, residential construction, entertainment industry, and military aerospace. Other industries include software, automotive, ports, finance, tourism, biomedical, and regional logistics.

Transverse Ranges

Mount San Gorgonio, the highest mountain in Southern California San Gorgonio Mountain.jpg
Mount San Gorgonio, the highest mountain in Southern California
Even after the snow melts in San Bernardino, the San Bernardino Mountains in the background retain the snow. Sb 2004 dt snowskyline 003a.jpg
Even after the snow melts in San Bernardino, the San Bernardino Mountains in the background retain the snow.

Southern California is separated from the rest of the state by the east–west trending Transverse Ranges, including the Tehachapi, which separate the Central Valley from the Mojave Desert. Urban Southern California intersperses the valleys between the Santa Susana Mountains, Santa Monica Mountains and San Gabriel Mountains, which range from the Pacific Coast, eastward over 100 miles (160 km), to the San Bernardino Mountains, north of San Bernardino. The highest point of the range is Mount San Gorgonio at 11,499 feet (3,505 m). The San Gabriel Mountains have Mount Wilson observatory, where the redshift was discovered in the 1920s.

The Transverse Ranges include a series of east–west trending mountain ranges that extend from Point Conception at the western tip of Santa Barbara County, eastward (and a bit south) to the east end of the San Jacinto Mountains in western Riverside County. The Santa Ynez Mountains make up the westernmost ranges, extending from Point Conception to the Ventura River just west-northwest of Ojai, in Ventura County. Pine Mountain Ridge, Nordhoff Ridge–Topatopa Mountains, Rincon Peak–Red Mountain, Sulphur Mountain, Santa Paula Ridge, South Mountain–Oat Mountain–Santa Susana Mountains, Simi Hills, Conejo Mountains–Santa Monica Mountains are all part of the Western Transverse Ranges, in Ventura and western Los Angeles counties.

The Liebre Mountains occupy the northwest corner of Los Angeles County, and represent a northwestern extension of the San Gabriel Mountains, both on the Pacific Plate side of the San Andreas Fault. The fault divides the San Gabriel Mountains from the San Bernardino Mountains further to the east in San Bernardino County.

It is possible to surf in the Pacific Ocean and ski on a mountain during the same winter day in Southern California.

Mojave Desert

Badwater Basin: the lowest point in North America at -279 feet (-85 m). Badwater Basin from Dantes View-800px.JPG
Badwater Basin: the lowest point in North America at −279 feet (−85 m).

There are harsh deserts in the Southeast of California. These deserts are caused by a combination of the cold offshore current, which limits evaporation, and the rain shadow of the mountains. The prevailing winds blow from the ocean inland. When the air passes over the mountains, adiabatic cooling causes most water in the air to rain on the mountains. When the air returns to sea level on the other side of the mountains, it recompresses, warms and dries, parching the deserts. When the wind blows from inland, the resulting hot dry katabatic winds are called the Santa Ana Winds.

The Mojave Desert is bounded by the peninsular Tehachapi Mountains on the Northwest, together with the San Gabriel and the San Bernardino Mountains on the Southwest. These Western boundaries are quite distinct, forming the dominant pie-slice shaped Antelope Valley in Southern California. The outlines of this valley are caused by the two largest faults in California: the San Andreas and the Garlock. The Mojave Desert extends Eastward into the State of Nevada. The Mojave Desert receives less than 6 inches (150 mm) of rain a year and is generally between 3,000 and 6,000 feet (1,000 and 2,000 m) of elevation. Areas such as the Antelope Valley desert which is a high desert received snow each year, in the past it could snow 2–3 times a year; however, recently snow level has declined significantly to once a year or less. Most of the towns and cities in the California portion of the Mojave are relatively small, except for Palmdale and Lancaster. However, some are quite famous like Barstow, a popular stop on the famous U.S. Route 66. The Mojave Desert also contains the lowest, hottest place in the Americas: Death Valley, where temperature normally approaches 120 °F (49 °C), in late July and early August.

Peninsular Ranges

The southernmost mountains of California are the Peninsular Ranges, which are east of San Diego and continue into Baja California (Mexico) in the Sierra San Pedro Martir. The Peninsular Ranges contain the Laguna Mountains, the San Jacinto Mountains, the Santa Rosa Mountains, the Santa Ana Mountains and the Palomar Mountain Range, notable for its famous Palomar observatory. San Jacinto Peak's eastern shoulder has a cable tram that runs from the desert floor to nearly the top of the mountain where riders can set off hiking or go cross-country skiing.

Colorado Desert

The Coachella Valley Preserve CoachellaValleyPreserve.jpg
The Coachella Valley Preserve

To the east of the peninsular ranges lie the Colorado and Sonoran Deserts, which extend into Arizona and Mexico.

The ground elevation is generally lower and in some areas was compressed downward, therefore the eastern Coachella and Imperial Valleys north of the U.S.-Mexican border are below sea level, the lowest community in the U.S. is Calipatria, California, at 180 feet (55 m) below sea level. [17]

One feature of the desert is the Salton Sea, an inland lake that was formed in 1905 when a swollen Colorado River breached a canal near the U.S.-Mexico border and flowed into the Salton Sink (Salton Basin) for almost two years. Today, the Salton Sea, a new version of historic Lake Cahuilla, remains as California's largest lake.

Pacific Ocean

The Pacific Ocean lies to the west of California. Owing to the long length of the state, Sea temperatures generally range from 50 °F (10 °C) in the northernmost parts during winter to 70 °F (21 °C) in the south coast during summer. The lower seasonal temperature variance compared to the waters of the East Coast is because of up-welling deep waters with dissolved nutrients. Therefore, sea life in and around California has examples of both Arctic and tropical, biotopes, leaning more towards the latter in the south coast and vice versa. The sea off California is remarkably fertile, a murky green filled with a massive variety of fish, rather than the clear dead blue of most tropical seas. Before 1930, there was an extremely valuable sardine (herring) fishery off Monterey, but this was depleted, an event later famous as the background to John Steinbeck's Cannery Row .

California's coastline is about 840 miles long, the third longest coastline in the United States after Alaska and Florida.

Geology

Faults, volcanoes, and tsunamis

Earthquakes occur due to faults that run the length of the Pacific coast, the largest being the San Andreas Fault. Major historical earthquakes include, with the magnitudes listed:

Coastal cities are vulnerable to tsunamis from locally generated earthquakes as well as those elsewhere in the Pacific Ring of Fire. The Great Chilean earthquake tsunami (1960) killed one person and caused $500,000 to $1,000,000 dollars of damage in Los Angeles, damaged harbors in many coastal cities, and flooded streets in Crescent City. [18] Waves from the Alaskan Good Friday earthquake of 1964 killed twelve people in Crescent City and caused damage as far south as Los Angeles. USGS has released the UCERF California earthquake forecast which models earthquake occurrence in California.

California is also home to several volcanoes, including Lassen Peak, which erupted in 1914 and 1921, and Mount Shasta.

Tectonics

California, when only partially explored by the Spanish, was once thought to be an island, as when the southern Baja California Peninsula is approached from the Gulf of California the land appears to the west. It is expected, through the motions of plate tectonics that the sea floor spreading now acting in the Gulf of California (also known as the Sea of Cortez) will eventually extend through Southern California and along the San Andreas fault to below San Francisco, finally forming a long island in less than 150 million years. (For comparison, this is also the approximate age of the Atlantic Ocean.) Predictions suggest that this island will eventually collide with Alaska after an additional 100 million years.

California map of Koppen climate classification. California Koppen.svg
California map of Köppen climate classification.

Climate

California's climate varies widely, from arid to subarctic, depending on latitude, elevation, and proximity to the coast. Coastal and Southern parts of the state have a Subtropical Mediterranean climate, with somewhat rainy winters and dry summers. The influence of the ocean generally moderates temperature extremes, creating warmer winters and substantially cooler summers, especially along the coastal areas.

The state is subject to coastal storms during the winter. Eastern California is subject to summertime thunderstorms caused by the North American monsoon. Dry weather during the rest of the year produces conditions favorable to wildfires. California hurricanes occur less frequently than their counterparts on the Atlantic Ocean. Higher elevations experience snowstorms in the winter months.

Floods are occasionally caused by heavy rain, storms, and snowmelt. Steep slopes and unstable soil make certain locations vulnerable to landslides in wet weather or during earthquakes.

See also

Related Research Articles

<span class="mw-page-title-main">Geography of the United States</span> Overview of the geography of the United States

The term 'United States', when used in the geographical sense, refers to the contiguous United States, the state of Alaska, the island state of Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, and American Samoa, and minor outlying possessions. The United States shares land borders with Canada and Mexico and maritime borders with Russia, Cuba, The Bahamas, and other countries, in addition to Canada and Mexico. The northern border of the United States with Canada is the world's longest bi-national land border.

<span class="mw-page-title-main">Sierra Nevada</span> Mountain range in the Western United States

The Sierra Nevada is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primarily in Nevada. The Sierra Nevada is part of the American Cordillera, an almost continuous chain of mountain ranges that forms the western "backbone" of the Americas.

<span class="mw-page-title-main">Southern California</span> American geographic and cultural region

Southern California is a geographic and cultural region that generally comprises the southern portion of the U.S. state of California. It includes the Los Angeles metropolitan area, the second most populous urban agglomeration in the United States. The region generally contains ten of California's 58 counties: Imperial, Kern, Los Angeles, Orange, Riverside, San Bernardino, San Diego, Santa Barbara, San Luis Obispo and Ventura counties.

<span class="mw-page-title-main">U.S. Route 395</span> Highway in the United States

U.S. Route 395 is a U.S. Route in the western United States. The southern terminus of the route is in the Mojave Desert at Interstate 15 near Hesperia. The northern terminus is at the Canada–US border near Laurier, where the road becomes Highway 395 upon entering British Columbia, Canada. Before 1964, the route extended south to San Diego. I-15, I-215, and California State Route 163 replaced the stretch of 395 that ran from San Diego to Hesperia through Riverside and San Bernardino. "Old Highway 395" can be seen along or near I-15 in many locations before it branches off at Hesperia to head north. It has also been referred to as the "Three Flags Route."

<span class="mw-page-title-main">Pacific Coast Ranges</span> Series of mountain ranges along the Pacific coast of North America

The Pacific Coast Ranges are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico. Although they are commonly thought to be the westernmost mountain range of the continental United States and Canada, the geologically distinct Insular Mountains of Vancouver Island lie further west.

<span class="mw-page-title-main">Transverse Ranges</span> Group of mountain ranges of southern California

The Transverse Ranges are a group of mountain ranges of southern California, in the Pacific Coast Ranges physiographic region in North America. The Transverse Ranges begin at the southern end of the California Coast Ranges and lie within Santa Barbara, Ventura, Los Angeles, San Bernardino, Riverside and Kern counties. The Peninsular Ranges lie to the south. The name Transverse Ranges is due to their east–west orientation, making them transverse to the general northwest–southeast orientation of most of California's coastal mountains.

<span class="mw-page-title-main">Ecology of California</span> Environments and natural history of California

The ecology of California can be understood by dividing the state into a number of ecoregions, which contain distinct ecological communities of plants and animals in a contiguous region. The ecoregions of California can be grouped into four major groups: desert ecoregions, Mediterranean ecoregions, forested mountains, and coastal forests.

<span class="mw-page-title-main">California State Route 14</span> State highway in Los Angeles and Kern counties in California, United States

State Route 14 is a north–south state highway in the U.S. state of California that connects Los Angeles to the northern Mojave Desert. The southern portion of the highway is signed as the Antelope Valley Freeway. The route connects Interstate 5 on the border of the city of Santa Clarita to the north and the Los Angeles neighborhoods of Granada Hills and Sylmar to the south, with U.S. Route 395 (US 395) near Inyokern. Legislatively, the route extends south of I-5 to SR 1 in the Pacific Palisades area of Los Angeles; however, the portion south of the junction with I-5 has not been constructed. The southern part of the constructed route is a busy commuter freeway serving and connecting the cities of Santa Clarita, Palmdale, and Lancaster to the rest of the Greater Los Angeles area. The northern portion, from Vincent to US 395, is legislatively named the Aerospace Highway, as the highway serves Edwards Air Force Base, once one of the primary landing strips for NASA's Space Shuttle. This section is rural, following the line between the hot Mojave desert and the forming Sierra Nevada mountain range. Most of SR 14 is loosely paralleled by a main line of the Southern Pacific Railroad, used for the Antelope Valley Line of the Metrolink commuter rail system as well as a connection between Los Angeles and the Central Valley via Tehachapi Pass.

<span class="mw-page-title-main">Tehachapi Mountains</span> Mountain range of the Transverse Ranges in California, United States

The Tehachapi Mountains are a mountain range in the Transverse Ranges system of California in the Western United States. The range extends for approximately 40 miles (64 km) in southern Kern County and northwestern Los Angeles County and form part of the boundary between the San Joaquin Valley and the Mojave Desert.

<span class="mw-page-title-main">San Bernardino Mountains</span> Mountain range of the Transverse Ranges in California, United States

The San Bernardino Mountains are a high and rugged mountain range in Southern California in the United States. Situated north and northeast of San Bernardino and spanning two California counties, the range tops out at 11,503 feet (3,506 m) at San Gorgonio Mountain – the tallest peak in all of Southern California. The San Bernardinos form a significant region of wilderness and are popular for hiking and skiing.

<span class="mw-page-title-main">San Jacinto Mountains</span> Mountain range in Riverside County, in southern California

The San Jacinto Mountains are a mountain range in Riverside County, located east of Los Angeles in southern California in the United States. The mountains are named for one of the first Black Friars, Saint Hyacinth, who is a popular patron in Latin America.

The State Scenic Highway System in the U.S. state of California is a list of highways, mainly state highways, that have been designated by the California Department of Transportation (Caltrans) as scenic highways. They are marked by the state flower, a California poppy, inside either a rectangle for state-maintained highways or a pentagon for county highways.

<span class="mw-page-title-main">North American Cordillera</span> North American portion of the American Cordillera mountain chain

The North American Cordillera, sometimes also called the Western Cordillera of North America, the Western Cordillera or the Pacific Cordillera, is the North American portion of the American Cordillera, the mountain chain system (cordillera) along the western coast of the Americas. The North American Cordillera covers an extensive area of mountain ranges, intermontane basins and plateaus in Western/Northwestern Canada, Western United States and Mexico, including much of the territory west of the Great Plains.

The Walker Lane is a geologic trough roughly aligned with the California/Nevada border southward to where Death Valley intersects the Garlock Fault, a major left lateral, or sinistral, strike-slip fault. The north-northwest end of the Walker Lane is between Pyramid Lake in Nevada and California's Lassen Peak where the Honey Lake Fault Zone, the Warm Springs Valley Fault, and the Pyramid Lake Fault Zone meet the transverse tectonic zone forming the southern boundary of the Modoc Plateau and Columbia Plateau provinces. The Walker Lane takes up 15 to 25 percent of the boundary motion between the Pacific Plate and the North American Plate, the other 75 percent being taken up by the San Andreas Fault system to the west. The Walker Lane may represent an incipient major transform fault zone which could replace the San Andreas as the plate boundary in the future.

<span class="mw-page-title-main">U.S. Route 395 in California</span> Highway in California

U.S. Route 395 (US 395) is a United States Numbered Highway, stretching from Hesperia, California to the Canadian border in Laurier, Washington. The California portion of US 395 is a 557-mile (896 km) route which traverses from Interstate 15 (I-15) in Hesperia, north to the Oregon state line in Modoc County near Goose Lake. The route clips into Nevada, serving the cities Carson City and Reno, before returning to California.

<span class="mw-page-title-main">Outline of California</span> Overview of and topical guide to California

The following outline is provided as an overview of and topical guide to the U.S. state of California.

The geology of California is highly complex, with numerous mountain ranges, substantial faulting and tectonic activity, rich natural resources and a history of both ancient and comparatively recent intense geological activity. The area formed as a series of small island arcs, deep-ocean sediments and mafic oceanic crust accreted to the western edge of North America, producing a series of deep basins and high mountain ranges.

<span class="mw-page-title-main">Cascade-Sierra province</span> Physio-graphic region in the western United States

The Cascade-Sierra province is a physiographic region of mountains in the western United States, east and adjacent to Pacific Border province and west and adjacent to the Basin and Range Province and Columbia Plateau Province.

References

  1. Barnard, Jeff (May 19, 1985). "California–Oregon Dispute : Border Fight Has Townfolk on Edge". Los Angeles Times.
  2. "Klamath Mountains". Peakbagger. Retrieved 2015-12-16.
  3. Skinner, C.N.; Taylor, A.H.; Agee, J.K. (2006). "Klamath Mountains bioregion". In Sugihara, N.G.; van Wagtendonk, J.W.; Fites-Kaufman, J.; Shaffer, K.E.; Thode, A.E. (eds.). Fire in California's Ecosystems. Berkeley, CA: University of California Press. pp. 170–194.
  4. "KLAMATH-SISKIYOU REGION, California and Oregon, U.S.A." North America Regional Centre of Endemism. Smithsonian Institution. Archived from the original on 2011-06-06. Retrieved 2011-11-26.
  5. Beckey, Fred W. (2000). Cascade Alpine Guide: Columbia River to Stevens Pass. Mountaineers Press. p. 11.
  6. Singh, Pratap; Haritashya, Umesh Kumar (2011). Encyclopedia of Snow, Ice and Glaciers. Springer. p. 111.
  7. 1 2 Harris, Stephen L. (2005). Fire Mountains of the West: The Cascade and Mono Lake Volcanoes (3rd ed.). Mountain Press Publishing Company. ISBN   978-0-87842-220-3.
  8. "Eruptions of Lassen Peak". USGS. Fact Sheet 173-98. Retrieved 2011-11-26.
  9. 1 2 3 4 5 "Modoc Plateau Region" (PDF). California Wildlife Action Plan. California Department of Fish and Game. 2007. Archived from the original (PDF) on 2009-05-02.
  10. Sugihara, Neil G. (2006). Fire in California's ecosystems. University of California Press. p. 225.
  11. "Modoc National Wildlife Refuge". US Fish and Wildlife Service.
  12. "Basin and Range Province". USGS Geology in the Parks. USGS. Archived from the original on 2009-01-25. Retrieved 2012-01-15.
  13. Harris, S.L. (2005). Fire Mountains of the West: The Cascade and Mono Lake Volcanoes. Mountain Press. p. 61. ISBN   978-0-87842-511-2.
  14. Smith, Genny; Putnam, Jeff (1976). Deepest Valley: a Guide to Owens Valley, its roadsides and mountain trails (2nd ed.). Genny Smith books. ISBN   0-931378-14-1.
  15. US Geological Survey (30 June 2000). "Shoreline Butte: Ice age Death Valley". Death Valley Geology Field Trip Shoreline Butte. Department of the Interior. Retrieved 2009-09-10.
  16. Bain, G. Donald (2001). "Explore the Methuselah Grove". NOVA Online: Methuselah Tree. PBS.
  17. "Geographic Names Information System".
  18. May 22, 1960 Tsunami

Coordinates: 37°9′58″N119°26′58″W / 37.16611°N 119.44944°W / 37.16611; -119.44944 (Center of California)