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John C. Crowell
John J. Chambers Crowell (May 12, 1917, State College, Pennsylvania – May 13, 2015, Montecito, California) was an American professor of geology, known for his research in tectonics, sedimentation, and the geology of California, especially his studies of the San Andreas Fault. Education and career Born in Pennsylvania and the son of a father who became a professor of Romance languages at Claremont Colleges, John Crowell went to high school in Los Angeles County, California, and graduated from the University of Texas at Austin in 1939 with a degree in geology. He then matriculated as a graduate student in geology at the University of California, Los Angeles (UCLA). During his study of the geology of part of the San Joaquin Valley, he was offered employment as a geologist by the Shell Oil Company. He briefly worked for that company before the United States entered WW II. He joined the U.S. Army, was given intensive training as an oceanographic meteorologist, and in May 1943 was commi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
State College, Pennsylvania
State College is a Borough (Pennsylvania), borough and Home rule municipality (Pennsylvania), home rule municipality in Centre County, Pennsylvania, United States. It is a college town, home to the University Park, Pennsylvania, University Park campus of Pennsylvania State University, The Pennsylvania State University. State College is the largest designated borough in Pennsylvania. It is the principal borough of the six municipalities that make up the Happy Valley (Pennsylvania), State College area, the largest settlement in Centre County, Pennsylvania, Centre County and one of the principal cities of the greater State College–DuBois, PA Combined Statistical Area, State College-DuBois Combined Statistical Area with a combined population of 236,577 as of the 2010 United States census, 2010 U.S. census. In the 2010 census, the borough population was 42,034. History Indigenous peoples The Lenape, Delaware, Iroquois, Mingo, and Shawnee were some of the first native inhabitants w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manila
Manila, officially the City of Manila, is the Capital of the Philippines, capital and second-most populous city of the Philippines after Quezon City, with a population of 1,846,513 people in 2020. Located on the eastern shore of Manila Bay on the island of Luzon, it is classified as a Cities of the Philippines#Independent cities, highly urbanized city. With , Manila is one of the world's List of cities proper by population density, most densely populated cities proper. Manila was the first chartered city in the country, designated bPhilippine Commission Act No. 183on July 31, 1901. It became autonomous with the passage of Republic Act No. 409, "The Revised Charter of the City of Manila", on June 18, 1949. Manila is considered to be part of the world's original set of global cities because its commercial networks were the first to extend across the Pacific Ocean and connect Asia with the Hispanic America, Spanish Americas through the Manila galleon, galleon trade. This marked t ... [...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] |
Kinematics
In physics, kinematics studies the geometrical aspects of motion of physical objects independent of forces that set them in motion. Constrained motion such as linked machine parts are also described as kinematics. Kinematics is concerned with systems of specification of objects' positions and velocities and mathematical transformations between such systems. These systems may be rectangular like Cartesian coordinate system, cartesian, Curvilinear coordinates like polar coordinates or other systems. The object trajectories may be specified with respect to other objects which may themselve be in motion relative to a standard reference. Rotating systems may also be used. Numerous practical problems in kinematics involve constraints, such as mechanical linkages, ropes, or rolling disks. Overview Kinematics is a subfield of physics and mathematics, developed in classical mechanics, that describes the motion of points, Physical object, bodies (objects), and systems of bodies (group ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flysch
Flysch () is a sequence of sedimentary rock layers that progress from deep-water and turbidity flow deposits to shallow-water shales and sandstones. It is deposited when a deep basin forms rapidly on the continental side of a mountain building episode. Examples are found near the North American Cordillera, the Alps, the Pyrenees and the Carpathians. Sedimentological properties Flysch consists of repeated sedimentary cycles with upwards fining of the sediments. There are sometimes coarse conglomerates or breccias at the bottom of each cycle, which gradually evolve upwards into sandstone and shale/mudstone. Flysch typically consists of a sequence of shales rhythmically interbedded with thin, hard, graywacke-like sandstones. Typically the shales do not contain many fossils, while the coarser sandstones often have fractions of micas and glauconite. Tectonics In a continental collision, a subducting tectonic plate pushes on the plate above it, making the rock fold, often t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbidity Current
A turbidity current is most typically an Ocean current, underwater current of usually rapidly moving, sediment-laden water moving down a slope; although current research (2018) indicates that water-saturated sediment may be the primary actor in the process. Turbidity currents can also occur in other fluids besides water. Researchers from the Monterey Bay Aquarium Research Institute found that a layer of water-saturated sediment moved rapidly over the seafloor and mobilized the upper few meters of the preexisting seafloor. Plumes of sediment-laden water were observed during turbidity current events but they believe that these were secondary to the pulse of the seafloor sediment moving during the events. The belief of the researchers is that the water flow is the tail-end of the process that starts at the seafloor. In the most typical case of oceanic turbidity currents, sediment laden waters situated over sloping ground will flow down-hill because they have a higher density th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Canyon
A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to , from canyon floor to canyon rim, as with the Great Bahama Canyon. Just as above-sea-level canyons serve as channels for the flow of water across land, submarine canyons serve as channels for the flow of turbidity currents across the seafloor. Turbidity currents are flows of dense, sediment laden waters that are supplied by rivers, or generated on the seabed by storms, submarine landslides, earthquakes, and other soil disturbances. Turbidity currents travel down slope at great speed (as much as ), eroding the continental slope and finally depositing sediment onto the abyssal plain, where the particles settle out.Continental Margin Sedimentation: From Sediment Transport to Sequence Stratigraphy (Special Publication 37 of the IAS) March 2009, by Charles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleoclimatology
Paleoclimatology ( British spelling, palaeoclimatology) is the scientific study of climates predating the invention of meteorological instruments, when no direct measurement data were available. As instrumental records only span a tiny part of Earth's history, the reconstruction of ancient climate is important to understand natural variation and the evolution of the current climate. Paleoclimatology uses a variety of proxy methods from Earth and life sciences to obtain data previously preserved within rocks, sediments, boreholes, ice sheets, tree rings, corals, shells, and microfossils. Combined with techniques to date the proxies, the paleoclimate records are used to determine the past states of Earth's atmosphere. The scientific field of paleoclimatology came to maturity in the 20th century. Notable periods studied by paleoclimatologists include the frequent glaciations that Earth has undergone, rapid cooling events like the Younger Dryas, and the rapid warming du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lawrence A
Lawrence may refer to: Education Colleges and universities * Lawrence Technological University, a university in Southfield, Michigan, United States * Lawrence University, a liberal arts university in Appleton, Wisconsin, United States Preparatory & high schools * Lawrence Academy at Groton, a preparatory school in Groton, Massachusetts, United States * Lawrence College, Ghora Gali, a high school in Pakistan * Lawrence School, Lovedale, a high school in India * The Lawrence School, Sanawar, a high school in India Research laboratories * Lawrence Berkeley National Laboratory, United States * Lawrence Livermore National Laboratory, United States People * Lawrence (given name), including a list of people with the name * Lawrence (surname), including a list of people with the name * Lawrence (band), an American soul-pop group * Lawrence (judge royal) (died after 1180), Hungarian nobleman, Judge royal 1164–1172 * Lawrence (musician), Lawrence Hayward (born 1961), Briti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Association Of Petroleum Geologists
The American Association of Petroleum Geologists (AAPG) is one of the world's largest professional geological societies with about 17,000 members across 129 countries. The AAPG works to "advance the science of geology, especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources; to promote the technology of exploring for, finding, and producing these materials in an economically and environmentally sound manner; and to advance the professional well-being of its members." The AAPG was founded in 1917 and is headquartered in Tulsa, Oklahoma; currently almost one-third of its members live outside the United States. Over the years, the activities of the AAPG have broadened so that they bring together not just geology but also geophysics, geochemistry, engineering, and innovative analytics to enable the more efficient and environmentally-friendly approaches to the development of all earth-based energy sources. New transformative technologies, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structural Geology
Structural geology is the study of the three-dimensional distribution of rock units with respect to their deformational histories. The primary goal of structural geology is to use measurements of present-day rock geometries to uncover information about the history of deformation ( strain) in the rocks, and ultimately, to understand the stress field that resulted in the observed strain and geometries. This understanding of the dynamics of the stress field can be linked to important events in the geologic past; a common goal is to understand the structural evolution of a particular area with respect to regionally widespread patterns of rock deformation (e.g., mountain building, rifting) due to plate tectonics. Use and importance The study of geologic structures has been of prime importance in economic geology, both petroleum geology and mining geology. Folded and faulted rock strata commonly form traps that accumulate and concentrate fluids such as petroleum and natural gas. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Preston Cloud
Preston Ercelle Cloud, Jr. (September 26, 1912 – January 16, 1991) was an American earth scientist, biogeologist, cosmologist, and paleontologist. He served in the United States Navy (in which he was a bantamweight boxing champion), and led several field explorations of the U.S. Geological Survey. In academia, he was a member of the faculty of Harvard University, University of Minnesota, University of California, Los Angeles, and lastly University of California, Santa Barbara. He was best known for his work on the geologic time scale and the origin of life on Earth, and as a pioneering ecologist and environmentalist. His works on the significance of Cambrian fossils in the 1940s led to the development of the concept " Cambrian explosion," for which he coined the phrase "eruptive evolution." Early life and education Cloud was born in West Upton, Massachusetts. He was the third of seven children of Preston Ercelle and Pauline L. (''née'' Wiedemann) Cloud. His father was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
