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Sediment Gravity Flows
upright=1.25, This Devonian.html" ;"title="turbidite from the Devonian">turbidite from the Devonian Becke-Oese Sandstone of Germany is an example of a deposit from a sediment gravity flow. Note the complete Bouma sequence. A sediment gravity flow is one of several types of sediment transport mechanisms, of which most geologists recognize four principal processes. These flows are differentiated by their dominant sediment support mechanisms, which can be difficult to distinguish as flows can be in transition from one type to the next as they evolve downslope. Sediment support mechanisms Sediment gravity flows are represented by four different mechanisms of keeping grains within the flow in suspension. * Grain flow – Grains in the flow are kept in suspension by grain-to-grain interactions, with the fluid acting only as a lubricant. As such, the grain-to-grain collisions generate a dispersive pressure that helps prevent grains from settling out of suspension. Although common in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian Turbidite Becke-Oese
The Devonian ( ) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago ( Ma), to the beginning of the succeeding Carboniferous period at Ma. It is the fourth period of both the Paleozoic and the Phanerozoic. It is named after Devon, South West England, where rocks from this period were first studied. The first significant evolutionary radiation of life on land occurred during the Devonian, as free- sporing land plants (pteridophytes) began to spread across dry land, forming extensive coal forests which covered the continents. By the middle of the Devonian, several groups of vascular plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants ( pteridospermatophytes) appeared. This rapid evolution and colonization process, which had begun during the Silurian, is known as the Silurian-Devonian Terrestrial Revolu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ladakh
Ladakh () is a region administered by India as a union territory and constitutes an eastern portion of the larger Kashmir region that has been the subject of a Kashmir#Kashmir dispute, dispute between India and Pakistan since 1947 and India and China since 1959.The application of the term "administered" to the various regions of Kashmir and a mention of the Kashmir dispute is supported by the WP:TERTIARY, tertiary sources (a) through (e), reflecting WP:DUE, due weight in the coverage. Although "controlled" and "held" are also applied neutrally to the names of the disputants or to the regions administered by them, as evidenced in sources (h) through (i) below, "held" is also considered politicised usage, as is the term "occupied", (see (j) below). (a) (subscription required) Quote: "Kashmir, region of the northwestern Indian subcontinent ... has been the subject of dispute between India and Pakistan since the partition of the Indian subcontinent in 1947. The northern and wester ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lowe Sequence
The Lowe sequence describes a set of sedimentary structures in turbidite sandstone beds that are deposited by high-density turbidity currents. It is intended to complement, not replace, the better known Bouma sequence, which applies primarily to turbidites deposited by low-density (i.e., low-sand concentration), turbidity currents. Description The Lowe sequence adds three layers labelled S1 through S3 to Bouma's terminology, with S1 being at the bottom and S3 at the top of a sandy turbidite bed. As with the Bouma sequence, each layer has a specific set of sedimentary structures and lithology. And like the Bouma sequence, the layers become finer grained from bottom to top. The layers are described as follows. * S3 - Massive to graded, fine- to coarse-grained sandstones that overlie the S2 layer represent deposition from a turbulent suspension. Sometimes dish structures and dewatering pipes are present. This layer is essentially the same as the Bouma A layer. * S2 - Inverse (revers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dish Structure
Dish, dishes or DISH may refer to: Culinary * Dish (food), something prepared to be eaten * Dishware, plates and bowls for eating, cutting boards, silverware Communications * Dish antenna, a type of antenna * Dish Network, a satellite television provider in North America * Dish TV, a satellite television provider in India * Satellite dish, an antenna for receiving satellite signals * Stanford Dish, a U.S. Government-owned radio-telescope at Stanford University Arts, entertainment, and media * DISH (band), a Japanese band * Dish (American band), an American alternative rock band * "Dish", a 2016 single by Chancellor Other uses * Dish, Texas, a town in Denton County, Texas, United States * Diffuse idiopathic skeletal hyperostosis, a form of arthritis * Dish of a bicycle wheel * Let's Dish!, a meal preparation company in Minnesota * Petri dish, lab equipment mainly used in microbiology See also * Disch, surname * Dyche, surname * Diš (cuneiform), a sign in cun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an international border with the Mexico, Mexican state of Baja California to the south. With almost 40million residents across an area of , it is the List of states and territories of the United States by population, largest state by population and List of U.S. states and territories by area, third-largest by area. Prior to European colonization of the Americas, European colonization, California was one of the most culturally and linguistically diverse areas in pre-Columbian North America. European exploration in the 16th and 17th centuries led to the colonization by the Spanish Empire. The area became a part of Mexico in 1821, following Mexican War of Independence, its successful war for independence, but Mexican Cession, was ceded to the U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mojave Desert
The Mojave Desert (; ; ) is a desert in the rain shadow of the southern Sierra Nevada mountains and Transverse Ranges in the Southwestern United States. Named for the Indigenous peoples of the Americas, indigenous Mohave people, it is located primarily in southeastern California and southwestern Nevada, with small portions extending into Arizona and Utah. The Mojave Desert, together with the Sonoran Desert, Sonoran, Chihuahuan Desert, Chihuahuan, and Great Basin Desert, Great Basin deserts, form a larger List of North American deserts, North American desert. Of these, the Mojave is the smallest and driest. It displays typical basin and range topography, generally having a pattern of a series of parallel mountain ranges and valleys. It is also the site of Death Valley, which is the lowest elevation in North America. The Mojave Desert is often colloquially called the "high desert", as most of it lies between . It supports a diversity of flora and fauna. The desert supports a numb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kelso, California
Kelso is a ghost town A ghost town, deserted city, extinct town, or abandoned city is an abandoned settlement, usually one that contains substantial visible remaining buildings and infrastructure such as roads. A town often becomes a ghost town because the economi ... and defunct railroad depot in the Mojave National Preserve in San Bernardino County, California, USA. It was named after railroad worker John H. Kelso, whose name was placed into a hat along with two other workers to decide the name of the town. The town was built in 1905 specifically as a railroad station along the rail line between Utah and Los Angeles, originally called "Siding 16," because of its location and nearby springs that provided abundant water. ''Historic Spots in California'' states, "At Kelso stands a beautiful Spanish-style Union Pacific Depot built about 1906, surrounded by shade trees, a welcome rarity in the hot, barren desert." History Starting off as what was a simple train depot in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traction (geology)
Traction is the geologic Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth s ... process whereby a current transports larger, heavier rocks by rolling or sliding them along the bottom. Thus, the grains and clasts interact with the substratum during transport. By contrast, saltation, a related sediment transport process, moves grains across the bottom by bouncing or hopping. The actual current carries the sediment load in traction and saltation flows, whereas downslope movement under the force of gravity carries the sediment in gravity flows. These processes contrast with suspension settling, in which there is no current.Ritter, M.E. (2006), The Physical Environment: an Introduction to Physical Geography: The Geologic Work of Streams,'' online textbook. accessed 25 June 2013. Traction is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bouma Sequence
300px, thumbnail, Devonian.html" ;"title="Turbidite from the Devonian">Turbidite from the Devonian-age Becke-Oese Sandstone, Germany showing a complete Bouma sequence. The Bouma sequence (named after , 1932–2011) describes a classic set of sedimentary structures in turbidite beds deposited by turbidity currents at the bottoms of lakes, oceans and rivers. Description The Bouma sequence specifically describes the ideal vertical succession of structures deposited by low-density (i.e., low sand concentration, fine-grained) turbidity currents. An alternate classification scheme that is generally called the Lowe sequence exists for the ideal vertical sequence of structures deposited by high-density flows. The Bouma sequence is divided into 5 distinct layers labelled A through E, with A being at the bottom and E being at the top. Each layer described by Bouma has a specific set of sedimentary structures and a specific lithology (see below), with the layers overall getting finer-gra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sedimentary Structure
Sedimentary structures include all kinds of features in sediments and sedimentary rocks, formed at the time of deposition. Sediments and sedimentary rocks are characterized by bedding, which occurs when layers of sediment, with different particle sizes are deposited on top of each other. These beds range from millimeters to centimeters thick and can even go to meters or multiple meters thick. Sedimentary structures such as cross-bedding, graded bedding, and ripple marks are utilized in stratigraphic studies. They help indicate the original position of strata in geologically complex terrains. They also provide insight into the depositional environment of the sediment. Flow structures There are two kinds of flow structures: bidirectional (multiple directions, back-and-forth) and unidirectional. Flow regimes in single-direction (typically fluvial) flow, which at varying speeds and velocities produce different structures, are called bedforms. In the ''lower flow regime'', the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dish Structure
Dish, dishes or DISH may refer to: Culinary * Dish (food), something prepared to be eaten * Dishware, plates and bowls for eating, cutting boards, silverware Communications * Dish antenna, a type of antenna * Dish Network, a satellite television provider in North America * Dish TV, a satellite television provider in India * Satellite dish, an antenna for receiving satellite signals * Stanford Dish, a U.S. Government-owned radio-telescope at Stanford University Arts, entertainment, and media * DISH (band), a Japanese band * Dish (American band), an American alternative rock band * "Dish", a 2016 single by Chancellor Other uses * Dish, Texas, a town in Denton County, Texas, United States * Diffuse idiopathic skeletal hyperostosis, a form of arthritis * Dish of a bicycle wheel * Let's Dish!, a meal preparation company in Minnesota * Petri dish, lab equipment mainly used in microbiology See also * Disch, surname * Dyche, surname * Diš (cuneiform), a sign in cun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
