|
Verdugo Mountains
The Verdugo Mountains, also known as the Verdugo Hills or simply The Verdugos, are a small, rugged mountain range of the Transverse Ranges system in Los Angeles County, California. Located just south of the western San Gabriel Mountains, the Verdugo Mountains region incorporates the cities of Burbank, Glendale, Pasadena, and La Cañada Flintridge; the unincorporated communities of Altadena and La Crescenta-Montrose; as well as the City of Los Angeles neighborhood of Sunland-Tujunga. It is where the borders of the San Gabriel Valley and the San Fernando Valley meet. Surrounded entirely by urban development, the Verdugo Mountains represent an isolated wildlife island and are in large part under public ownership in the form of undeveloped parkland. The mountains are used primarily for recreation in the form of hiking and mountain biking, and as the site of communications installations on the highest peaks. The mountains arise directly from the eastern floor of the San Fernand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Angeles County, California
Los Angeles County, officially the County of Los Angeles and sometimes abbreviated as LA County, is the List of United States counties and county equivalents, most populous county in the United States, with 9,663,345 residents estimated in 2023. Its population is greater than that of 40 individual List of U.S. states and territories by population, U.S. states. Comprising List of cities in Los Angeles County, California, 88 incorporated cities and List of unincorporated communities in Los Angeles County, California, 101+ unincorporated areas within a total area of , it is home to more than a quarter of Demographics of California, Californians and is one of the most ethnically diverse U.S. counties. The County seat, county's seat, Los Angeles, is the List of United States cities by population, second most populous city in the United States, with 3,820,914 residents estimated in 2023. The county is the domicile of the Cinema of the United States, U.S. motion picture industry since ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Rafael Hills
The San Rafael Hills are a mountain range in Los Angeles County, California. They are one of the lower Transverse Ranges, and are parallel to and below the San Gabriel Mountains, adjacent to the San Gabriel Valley overlooking the Los Angeles Basin. Geography To the west, the Verdugo Wash separates the San Rafael Hills from the Verdugo Mountains, and to the east, the Arroyo Seco separates them from the San Gabriel Valley and the Repetto Hills. At their southwestern margin, the Glendale Narrows section of the Los Angeles River separates them from the eastern tip of the Santa Monica Mountains. The San Rafael Hills contain all or parts of the communities of City Terrace, La Cañada Flintridge, Pasadena, South Pasadena, El Sereno, Monterey Hills, Montecito Heights, Cypress Park, Mount Washington, Glassell Park and foothills surrounding Eagle Rock, east of the Glendale Freeway including Rancho San Rafael and Chevy Chase Canyon in Glendale. They define the valley area ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz Diorite
Quartz diorite is an igneous, plutonic ( intrusive) rock, of felsic composition, with phaneritic texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less potassium feldspar. Quartz is present at between 5 and 20% of the rock. Biotite, amphiboles and pyroxenes are common dark accessory minerals. Quartz diorite occurs in association with other granitic rock such as granodiorite, and with volcanic A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often fo ... rock. In western North America a "quartz diorite line" occurs; west of this line, the dominant granitic rock is quartz diorite. References Definition with images Plutonic rocks ja:閃緑岩#石英閃緑岩 {{igneous-rock-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diorite
Diorite ( ) is an intrusive rock, intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is Intermediate composition, intermediate in composition between low-silica (mafic) gabbro and high-silica (felsic) granite. Diorite is found in mountain-building belts (''orogens'') on the margins of continents. It has the same composition as the fine-grained volcanic rock, andesite, which is also common in orogens. Diorite has been used since prehistoric times as decorative stone. It was used by the Akkadian Empire of Sargon of Akkad for funerary sculptures, and by many later civilizations for sculptures and building stone. Description Diorite is an intrusive rock, intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and sometimes pyroxene. The chemical composition of diorite is Intermedia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gneiss
Gneiss (pronounced ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. This rock is formed under pressures ranging from 2 to 15 kbar, sometimes even more, and temperatures over 300 °C (572 °F). Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct Cleavage (geology), cleavage. Gneisses are common in the ancient crust of Continental Shield, continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss. Description image:Orthogneiss Geopark.jpg, Orthogneiss from the Czech Republic In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding (gneissic banding) but poorly developed schistosity and indistinct Cleavage (geology), cleavage. In other words, it i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thrust Fault
A thrust fault is a break in the Earth's crust, across which older rocks are pushed above younger rocks. Thrust geometry and nomenclature Reverse faults A thrust fault is a type of reverse fault that has a dip of 45 degrees or less. If the angle of the fault plane is lower (often less than 15 degrees from the horizontal) and the displacement of the overlying block is large (often in the kilometer range) the fault is called an ''overthrust'' or ''overthrust fault''. Erosion can remove part of the overlying block, creating a ''fenster'' (or ''window'') – when the underlying block is exposed only in a relatively small area. When erosion removes most of the overlying block, leaving island-like remnants resting on the lower block, the remnants are called ''klippen'' (singular '' klippe''). Blind thrust faults If the fault plane terminates before it reaches the Earth's surface, it is called a ''blind thrust'' fault. Because of the lack of surface evidence, blind thrust fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverse Fault
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geological maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault Block
Fault blocks are very large blocks of rock, sometimes hundreds of kilometres in extent, created by Tectonics, tectonic and localized stresses in Crust (geology), Earth's crust. Large areas of bedrock are broken up into blocks by Fault (geology), faults. Blocks are characterized by relatively uniform lithology. The largest of these fault blocks are called crustal blocks. Large crustal blocks broken off from tectonic plates are called terranes. Those terranes which are the full thickness of the lithosphere are called microplates. Continent-sized blocks are called variously ''microcontinents, continental ribbons, H-blocks, extensional allochthons and outer highs.'' Because most stresses relate to the tectonic activity of moving Plate tectonics, plates, most motion between blocks is horizontal, that is parallel to the Earth's crust by Fault (geology)#Strike-slip faults, strike-slip faults. However vertical movement of blocks produces much more dramatic results. Landforms (mounta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sun Valley, Los Angeles
Sun Valley is a neighborhood in Los Angeles, California in the San Fernando Valley region. The neighborhood is known for its younger population. There are three recreation centers in Sun Valley, one of which is a historic site. The neighborhood has thirteen public schools—including John H. Francis Polytechnic High School and Valley Oaks Center for Enriched Studies (VOCES)—and four private schools. History The former Tongva/ Fernandeño (Native American) village in this area was called ''Wixánga,'' which comes from the word ''wixár'' (or "thorn" or "prickle" in English) in the Fernandeño dialect of the Tongva language. Hence, ''Wixánga'' meant something like "place/canyon of the thorns" in English, in reference to the abundant prickly pear cacti naturally found in the area. This was later reflected in the Spanish name for the area, or ''Cañada de las Tunas'' ("canyon of the thorns" in English). Finally, this became La Tuna Canyon, and now Sun Valley. In 1874, Cali ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shadow Hills, Los Angeles
Shadow Hills (originally Hansen Heights) is a neighborhood in the Verdugo Mountains and northeastern San Fernando Valley, within the city of Los Angeles, California. Geography Shadow Hills is in the northwestern Verdugo Mountains, near the western end of the Crescenta Valley. It is north of the city of Burbank and southeast of the Hansen Dam Reservoir. It is adjacent to the communities of Lake View Terrace to the north, Sunland and Tujunga to the east, Sun Valley to the south, and Pacoima to the west. The area is primarily equestrian zoned, one of the last remaining such neighborhoods within the City of Los Angeles. Shadow Hills is an acceptable city name for ZIP Code 91040, with Sunland the default city name assigned to 91040. Demographics As of the 2000 census, Shadow Hills had a population of 3,739 people. The racial breakdown was 79% Caucasian, 14% Latino, 3% Asian American, and 1% African American. In 2009, the ''Los Angeles Times''s "Mapping L.A." project suppl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Monica Mountains
The Santa Monica Mountains are a coastal mountain range in Southern California, next to the Pacific Ocean. It is part of the Transverse Ranges. The Santa Monica Mountains National Recreation Area encompasses this mountain range. Because of its proximity to densely populated regions, it is one of the most visited natural areas in California. Geography The range extends approximately east-west from the Hollywood Hills in Los Angeles to Point Mugu in Ventura County. The western mountains, separating the Conejo Valley from Malibu, suddenly end at Mugu Peak as the rugged, nearly impassible shoreline gives way to tidal lagoons and coastal sand dunes of the alluvial Oxnard Plain. The mountain range contributed to the isolation of this vast coastal plain before regular transportation routes reached western Ventura County. The eastern mountains form a barrier between the San Fernando Valley and the Los Angeles Basin, separating "the Valley" on the north and west-central Los Angeles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Angeles Basin
The Los Angeles Basin is a sedimentary Structural basin, basin located in Southern California, in a region known as the Peninsular Ranges. The basin is also connected to an wikt:anomalous, anomalous group of east–west trending chains of mountains collectively known as the Transverse Ranges. The present basin is a coastal lowland area, whose floor is marked by elongate low ridges and groups of hills that is located on the edge of the Pacific plate. The Los Angeles Basin, along with the Santa Barbara Channel, the Oxnard Plain, Ventura Basin, the San Fernando Valley, and the San Gabriel Valley, San Gabriel Basin, lies within the greater Southern California region. The majority of the jurisdictional land area of the city of Los Angeles physically lies within this basin. On the north, northeast, and east, the lowland Drainage basin, basin is bound by the Santa Monica Mountains and Puente, Elysian, and Repetto hills. To the southeast, the basin is bordered by the Santa Ana Mountains a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
