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14-September-2008 18:38:46 - Core sample Core sample. The product of a Diamond rig Core sample. The product of a Diamond rig A core sample is a cylindrical section of a naturally occurring medium consistent enough to hold a layered structure. In most cases cores are obtained by drilling into the medium with a hollow steel tube called a corer. The hole made for the core sample is called a core hole. A variety of corers exist to sample different media under different conditions. More continue to be invented. In the coring process the sample is pushed more or less intact into the tube. Removed from the tube in the laboratory, it is inspected and analyzed by different techniques and equipment depending on the type of data desired. Analysis is generally non-destructive of most of the sample. Contents 1 Methods 2 Management of cores and data 3 Layering 4 Informational value of core samples 5 See also 6 External links Methods or section by expanding it. Further information might be found on the talk page or at requests for expansion. August 2007 gravity coring, in which the core sampler is dropped into the sample drilling vibracoring, in which the sampler is vibrated to allow penetration into thixotropic media. Management of cores and data The technique of coring long predates attempts to drill into the Earth's mantle by the Deep Sea Drilling Program. The value to oceanic and other geologic history of obtaining cores over a wide area of sea floors soon became apparent. Core sampling by many scientific and exploratory organizations expanded rapidly. To date hundreds of thousands of core samples have been collected from floors of all the planet's oceans and many of its inland waters. Access to many of these samples is facilitated by the Index to Marine Lacustrine Geological Samples, A collaboration between twenty institutions and agencies that operate geological repositories. The above agency keeps a record of the samples held in the repositories of its member organizations. Data includes Lithography, texture, age, principal investigator, province, weathering/metamorphism, glass remarks and descriptive comments Layering Main article: Stratigraphy Any natural medium at or under the Earth's surface or other body that is consistent enough to maintain a solid or semi-solid structure is layered. The layering comes from successive deposition or growth in time of structural or compositional variants of the medium. Most familiar to us are the layers of the Earth's surface on which the geologic history of the surface is based; for example, the Eocene, Oligocene, Miocene, etc. Each layer in this case contains distinctive fossils generated by the evolution of species. Layers often are divided into sublayers. Layering is more pervasive than the broad outline of the Geologic Time Scale leads us to believe. Any change in environment causes a new layer to be deposited. A succession of plant species in a region, for example, causes a succession of layers containing different pollen in ice and mud. Variation in rainfall causes tree rings to be of different widths. Informational value of core samples Scientific coring began as a method of sampling the ocean floor. It soon expanded to lakes, ice, mud, soil and wood. Cores on very old trees give information about their growth rings without destroying the tree. Cores indicate variations of climate, species and sedimentary composition during geologic history. The dynamic phenomena of the Earth's surface are for the most part cyclical in a number of ways, especially temperature and rainfall. There are many ways to date a core. Once dated, it gives valuable information about changes of climate and terrain. For example, cores in the ocean floor, soil and ice have altered the view of the geologic history of the Pleistocene entirely. See also Ice core Scientific drilling Core drill External links Core Sample Aquifer Core Samples Core from Walden Pond Ice Core Dating Retrieved from http://en..org/wiki/Core_sample Categories: Earth sciencesHidden categories: Articles to be expanded since August 2007 | All articles to be expanded Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Italiano РуÑ?Ñ?кий SlovenÄ?ina This page was last modified on 9 September 2008, at 09:0
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