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San Gabriel Mountains
The San Gabriel Mountains () are a mountain range located in Los Angeles and San Bernardino counties, California, United States. The mountain range is part of the Transverse Ranges and lies between the Los Angeles Basin and the Mojave Desert, with Interstate 5 to the west and Interstate 15 to the east. The range lies in, and is surrounded by, the Angeles and San Bernardino National Forests, with the San Andreas Fault as its northern border. The highest peak in the range is Mount San Antonio, commonly referred to as Mt. Baldy. Mount Wilson is another notable peak, known for the Mount Wilson Observatory and the antenna farm that houses many of the transmitters for local media. The observatory may be visited by the public. On October 10, 2014, President Barack Obama designated the area the San Gabriel Mountains National Monument. The Trust for Public Land has protected more than of land in the San Gabriel Mountains, its foothills, and the Angeles National Forest. G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angeles National Forest
The Angeles National Forest (ANF) of the United States Forest Service is located in the San Gabriel Mountains and Sierra Pelona Mountains, primarily within Los Angeles County in Southern California. The ANF manages a majority of the San Gabriel Mountains National Monument. The national forest was established in 1908, incorporating the first San Bernardino National Forest and parts of the former Santa Barbara and San Gabriel National Forests. Angeles National Forest headquarters are located in Arcadia, California. Geography The Angeles National Forest covers a total of , protecting large areas of the San Gabriel Mountains and Sierra Pelona Mountains. It is located just north of the densely inhabited metropolitan area of Greater Los Angeles. While primarily within Los Angeles County, a small part extends eastward into southwestern San Bernardino County, in the Mount San Antonio ("Mount Baldy") area, and a tiny section also extends westward into northeastern Ventura Count ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Wilson Observatory
The Mount Wilson Observatory (MWO) is an Observatory#Astronomical observatories, astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson (California), Mount Wilson, a peak in the San Gabriel Mountains near Pasadena, California, Pasadena, northeast of Los Angeles. The observatory contains two historically important telescopes: the #100-inch Hooker telescope, Hooker telescope, which was the largest aperture telescope in the world from its completion in 1917 to 1949, and the #60-inch telescope, 60-inch telescope which was the largest operational telescope in the world when it was completed in 1908. It also contains the Snow solar telescope completed in 1905, the solar tower completed in 1908, the solar tower completed in 1912, and the CHARA array, built by Georgia State University, which became fully operational in 2004 and was the largest optical interferometer in the world at its completion. Due to the inversion (meteorol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dissected Plateau
A dissected plateau is a plateau area that has been severely eroded, and the relief is sharp. Such an area may be referred to as mountainous, but dissected plateaus are distinguishable from orogenic mountain belts by the lack of fold (geology), folding, Metamorphic rock, metamorphism, extensive Geological fault, faulting, or magmatic activity accompanying orogeny. Formation A dissected plateau may also be formed, usually on a comparatively small scale, by the levelling of terrain by planing and deposition beneath an ice sheet or perhaps an ice cap. Subsequently, during the same or a later Glaciation, glacial period, the margins of the Till, glacial till plain are removed by glaciers, leaving the plateau into which erosion by water incises valleys. Such a plateau may be level or gently sloping but may be distinguished by the till caps on its hills. Glacial till is still widely known in United Kingdom, Britain by the older name of boulder clay. Dissected volcanic plateaus includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene followed the Oligocene and preceded the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by distinct global events but by regionally defined transitions from the warmer Oligocene to the cooler Pliocene Epoch. During the Early Miocene, Afro-Arabia collided with Eurasia, severing the connection between the Mediterranean and Indian Oceans, and allowing the interchange of fauna between Eurasia and Africa, including the dispersal of proboscideans and Ape, hominoids into Eurasia. During the late Miocene, the conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sierra Madre Fault Zone
Situated at the boundary to the San Gabriel Valley and San Fernando Valley, the Sierra Madre Fault Zone (also known as the Sierra Madre-Cucamonga Fault) runs along the southern edge of the San Gabriel Mountains for a total of , where the northwesternmost comprises the San Fernando Fault (the section responsible for the 1971 San Fernando earthquake). A 1980s paleoseismic study that included a trench investigation and mapping revealed that a major earthquake had most likely not occurred to the east of the San Fernando rupture area for at least the last several thousand, and possibly the last 11,000 years. The 1971 event was the first in a series (1987 Whittier Narrows earthquake, 1987 Whittier Narrows, 1991 Sierra Madre earthquake, 1991 Sierra Madre, 1994 Northridge earthquake, 1994 Northridge) of damaging earthquakes which have occurred on reverse faults in the Los Angeles area. The events triggered discussions concerning the largest magnitude earthquake that could be generated by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Gabriel Fault
The San Gabriel Fault is a geological fault in Los Angeles County, California, running about southeastward from the Ridge Basin in the Sierra Pelona-San Emigdio Mountains juncture area to the western San Gabriel Mountains that forms their southwestern face near Sunland and the northeastern San Fernando Valley, and then on the south flank to the southeastern part of the San Gabriel range. Location and age The San Gabriel Fault is a right-lateral strike-slip that was last active between 10 and 5 million years ago – Late Quaternary west of intersection with the Sierra Madre Fault, and Quaternary east of that intersection, and Holocene only further west between Saugus and Castaic- Gorman. The San Gabriel Fault started 13-11 million years ago as a large part of the San Andreas Fault, and is believed to be the former path of it. It is part of the San Gabriel Fault Zone, which starts in the northwestern corner of the Ridge Basin, splits into two faults in its southeastern sectio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a Fracture (geology), planar fracture or discontinuity in a volume of Rock (geology), rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust (geology), crust result from the action of Plate tectonics, plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction, 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 (geometry), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crag (climbing)
Glossary of climbing terms relates to rock climbing (including aid climbing, lead climbing, bouldering, and competition climbing), mountaineering, and to ice climbing. ebook: The terms used can vary between different English-speaking countries; many of the phrases described here are particular to the United States and the United Kingdom. A B C D E F G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Trust For Public Land
The Trust for Public Land is a U.S. nonprofit organization with a mission to "create parks and protect land for people, ensuring healthy, livable communities for generations to come". Since its founding in 1972, the Trust for Public Land has completed 5,000 park-creation and land conservation projects across the United States, protected over 3 million acres, and helped pass more than 500 ballot measures—creating $70 billion in voter-approved public funding for parks and open spaces. The Trust for Public Land also researches and publishes authoritative data about parks, open space, conservation finance, and urban climate change adaptation. Headquartered in San Francisco, the organization is among the largest U.S. conservation nonprofits, with approximately 30 field offices across the U.S., including a federal affairs function in Washington, D.C. Focus areas Consistent with its "Land for People" mission, the Trust for Public Land is widely known for urban conservation work, inclu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NARA
The National Archives and Records Administration (NARA) is an independent agency of the United States government within the executive branch, charged with the preservation and documentation of government and historical records. It is also tasked with increasing public access to those documents that make up the National Archives. NARA is officially responsible for maintaining and publishing the legally authentic and authoritative copies of acts of Congress, presidential directives, and federal regulations. NARA also transmits votes of the Electoral College to Congress. It also examines Electoral College and constitutional amendment ratification documents for prima facie legal sufficiency and an authenticating signature. The National Archives, and its publicly exhibited Charters of Freedom, which include the original United States Declaration of Independence, Constitution of the United States, United States Bill of Rights, Emancipation Proclamation (starting in 2026), and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whitehouse
Whitehouse may refer to: People * Charles S. Whitehouse (1921–2001), American diplomat * Cornelius Whitehouse (1796–1883), English engineer and inventor * E. Sheldon Whitehouse (1883–1965), American diplomat * Elliott Whitehouse (born 1993), English footballer * Eula Whitehouse (1892–1974), American botanist * Frederick William Whitehouse (1900–1973), Australian geologist * Jimmy Whitehouse (footballer, born 1924) (1924–2005), English footballer * Mary Whitehouse (1910–2001), British Christian morality campaigner * Morris H. Whitehouse (1878–1944), American architect * Paul Whitehouse (born 1958), Welsh comedian and actor * Paul Whitehouse (police officer) (born 1944) * Sheldon Whitehouse (born 1955), American politician from the state of Rhode Island * Wildman Whitehouse (1816–1890), English surgeon and chief electrician for the transatlantic telegraph cable Places ;in the United Kingdom * Whitehouse, Aberdeenshire, location of the Whitehouse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Gabriel Mountains National Monument
The San Gabriel Mountains National Monument is a United States national monument managed by the U.S. Forest Service, which encompasses parts of the Angeles National Forest and the San Bernardino National Forest in California. On October 10, 2014, President Barack Obama used his authority under the Antiquities Act to create the new monument, protecting 346,177 acres of public lands in the San Gabriel Mountains of the Transverse Ranges. The effort to protect the San Gabriel Mountains began more than a century earlier, in 1891 with another U.S. President, Benjamin Harrison, the 23rd president, using a congressional act, to designate and delineate the first federal protection in the United States of forested lands, using the same mountain range name, as the San Gabriel Timberland Reserve. Two earlier California conservationists, Abbot Kinney and John Muir, influenced President Benjamin Harrison. The headquarters of the San Gabriel Mountains National Monument is located in Glendor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
