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Chazy Formation
The Chazy Reef Formation is a mid-Ordovician limestone deposit in northeastern North America. It consists of some of the oldest reef systems built by a community of organisms rather than the deposit of a limited range of similar organisms, such as Stromatolite mounds deposited by ancient cyanobacteria. The reef structure was formed largely by cryptostome and trepostome bryozoa, some of the oldest known bryozoans, but corals made an early appearance, and stromatoporoids. The formation is named for the small town of Chazy, New York, where the reef was noted by James Hall in ''Palaeontology of New York'' (vol. I, 1847) and the fossils first studied by the Canadian paleontologist Elkanah Billings (1858, 1859). The reef extends from Tennessee to Quebec and Newfoundland, but its most easily studied outcropping is at Goodsell Ridge, Isle La Motte, the northernmost island in Lake Champlain; there, gentle uplift has tilted the sediments: the bedding planes now dip slightly to the north, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chazy Reef Isle La Motte
{{disambiguation, geo ...
Chazy may refer to: *Chazy, New York, a town at Lake Champlain, New York **Chazy (CDP), New York, a hamlet in the town * Chazy Formation, a mid-Ordovician limestone deposit in northeastern North America *Chazy River, the name of two tributaries of Lake Champlain, New York *Jean Chazy (1882–1955), French mathematician **Chazy equation, a differential equation See also *Chazz (name) Chazz is an English masculine given name and nickname that is a diminutive form of Charles. Notable people with this name include the following: Nickname * Chazz Miller, nickname of Charles Miller (born 1963), American street art muralist *Chazz P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. , 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mollusca, and are the most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. The anatomy, behavior, feeding, and re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lagoon
A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') and ''atoll lagoons''. They have also been identified as occurring on mixed-sand and gravel coastlines. There is an overlap between bodies of water classified as coastal lagoons and bodies of water classified as estuaries. Lagoons are common coastal features around many parts of the world. Definition and terminology Lagoons are shallow, often elongated bodies of water separated from a larger body of water by a shallow or exposed shoal, coral reef, or similar feature. Some authorities include fresh water bodies in the definition of "lagoon", while others explicitly restrict "lagoon" to bodies of water with some degree of salinity. The distinction between "lagoon" and "estuary" also varies between authorities. Richard A. Davis Jr. restrict ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laurentia
Laurentia or the North American Craton is a large continental craton that forms the ancient geological core of North America. Many times in its past, Laurentia has been a separate continent, as it is now in the form of North America, although originally it also included the cratonic areas of Greenland and also the northwestern part of Scotland, known as the Hebridean Terrane. During other times in its past, Laurentia has been part of larger continents and supercontinents and itself consists of many smaller terranes assembled on a network of Early Proterozoic orogenic belts. Small microcontinents and oceanic islands collided with and sutured onto the ever-growing Laurentia, and together formed the stable Precambrian craton seen today. The craton is named after the Laurentian Shield, through the Laurentian Mountains, which received their name from the Saint Lawrence River, named after Lawrence of Rome. Interior platform In eastern and central Canada, much of the stable craton is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craton
A craton (, , or ; from grc-gre, κράτος "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost layers, the crust and the uppermost mantle. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates; the exceptions occur where geologically recent rifting events have separated cratons and created passive margins along their edges. Cratons are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as several hundred kilometres into Earth's mantle. Terminology The term ''craton'' is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable. Cratons are composed of two layers: A continental ''shield'', in which the basement rock crops out at the surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Continental Shelf
A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea. Much of these shelves were exposed by drops in sea level during glacial periods. The shelf surrounding an island is known as an ''insular shelf''. The continental margin, between the continental shelf and the abyssal plain, comprises a steep continental slope, surrounded by the flatter continental rise, in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope. Extending as far as 500 km (310 mi) from the slope, it consists of thick sediments deposited by turbidity currents from the shelf and slope. The continental rise's gradient is intermediate between the gradients of the slope and the shelf. Under the United Nations Convention on the Law of the Sea, the name continental shelf was given a legal definition as the stretch of the seabed adjacent to the shores of a par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iapetus Ocean
The Iapetus Ocean (; ) was an ocean that existed in the late Neoproterozoic and early Paleozoic eras of the geologic timescale (between 600 and 400 million years ago). The Iapetus Ocean was situated in the southern hemisphere, between the paleocontinents of Laurentia, Baltica and Avalonia. The ocean disappeared with the Acadian, Caledonian and Taconic orogenies, when these three continents joined to form one big landmass called Euramerica. The "southern" Iapetus Ocean has been proposed to have closed with the Famatinian and Taconic orogenies, meaning a collision between Western Gondwana and Laurentia. Because the Iapetus Ocean was positioned between continental masses that would at a much later time roughly form the opposite shores of the Atlantic Ocean, it can be seen as a sort of precursor of the Atlantic, and the process by which it opened shares many similarities with that of the Atlantic's initial opening in the Jurassic. The Iapetus Ocean was therefore named for the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Natural Landmark
The National Natural Landmarks (NNL) Program recognizes and encourages the conservation of outstanding examples of the natural history of the United States. It is the only national natural areas program that identifies and recognizes the best examples of biological and geological features in both public and private ownership. The program was established on May 18, 1962, by United States Secretary of the Interior Stewart Udall. The program aims to encourage and support voluntary preservation of sites that illustrate the geological and ecological history of the United States. It also hopes to strengthen the public's appreciation of the country's natural heritage. As of January 2021, 602 sites have been added to the National Registry of Natural Landmarks. The registry includes nationally significant geological and ecological features in 48 states, American Samoa, Guam, Puerto Rico, and the U.S. Virgin Islands. The National Park Service administers the NNL Program and if reques ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chazy Fossil Reef
Chazy Fossil Reef is a United States National Natural Landmark spanning three Lake Champlain islands in Clinton County, New York and Grand Isle County, Vermont. The site is recognized as the oldest known diverse fossil reef in the world, and contains fossils that demonstrate faunal succession. The site was dedicated as a National Natural Landmark in May 2009. Location The Chazy Fossil Reef National Natural Landmark includes three islands in Lake Champlain. Included within the designated area are two preserves on Vermont's Isle La Motte; the Fisk Quarry Preserve and the Goodsell Ridge Preserve are both open to the public and managed by the Isle La Motte Preservation Trust. New York's Valcour Island and Garden Island are also included as part of the landmark. Fossils The reef is an observable portion of the larger Chazy Formation which extends from Quebec to Tennessee. The location features an exposed Ordovician fossil reef, approximately 450 to 480 million years old, containi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vermont State House
The Vermont State House, located in Montpelier, is the state capitol of the U.S. state of Vermont. It is the seat of the Vermont General Assembly. The current Greek Revival structure is the third building on the same site to be used as the State House. Designed by Thomas Silloway in 1857 and 1858, it was occupied in 1859. A careful restoration of the Vermont State House began in the early 1980s led by curator David Schütz and the Friends of the Vermont State House, a citizens' advisory committee. The general style of the building is Neoclassical and Greek Revival and is furnished in American Empire, Renaissance Revival, and Rococo Revival styles. Some rooms have been restored to represent latter-19th-century styles including the " Aesthetic Movement" style. Since 1994, Buildings and General Services Architect, Tricia Harper has been responsible for design and construction for the restoration and renovation project of the building and its grounds. The Vermont State House i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio City Music Hall
Radio City Music Hall is an entertainment venue and Theater (structure), theater at 1260 Sixth Avenue (Manhattan), Avenue of the Americas, within Rockefeller Center, in the Midtown Manhattan neighborhood of New York City. Nicknamed "The Showplace of the Nation", it is the headquarters for the Rockettes. Radio City Music Hall was designed by Edward Durell Stone and Donald Deskey in the Art Deco style. Radio City Music Hall was built on a plot of land that was originally intended for a Metropolitan Opera House, although plans for the opera house were canceled in 1929. It opened on December 27, 1932, as part of the construction of Rockefeller Center. The 5,960-seat Music Hall was the larger of two venues built for Rockefeller Center's "Radio City" section, the other being Center Theatre (New York City), Center Theatre; the "Radio City" name later came to apply only to the Music Hall. It was largely successful until the 1970s, when declining patronage nearly drove the theater to bank ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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